Rho1 Arae

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ρ1 Arae
Ara IAU.svg
Cercle rouge 100%25.svg
The location of ρ1 Arae (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Ara
Right ascension 16h 56m 08.8405s [1]
Declination –50° 40′ 29.244″ [1]
Apparent magnitude  (V)6.275 [2]
Characteristics
Spectral type B3 Vnpe
U−B color index –0.691 [2]
B−V color index +0.008 [2]
Astrometry
Radial velocity (Rv)+19 [3]  km/s
Proper motion (μ)RA: –7.66 [1]   mas/yr
Dec.: –9.79 [1]   mas/yr
Parallax (π)5.06 ± 0.39  mas [1]
Distance 640 ± 50  ly
(200 ± 20  pc)
Absolute magnitude  (MV)−0.16 [4]
Orbit [5]
Period (P)236.50 ± 0.18 d
Inclination (i)60 ± 7°
Periastron epoch (T)HJD 2458672.10 ± 0.72
Semi-amplitude (K1)
(primary)		4.33 ± 0.05 km/s
Semi-amplitude (K2)
(secondary)		52.83 ± 1.49 km/s
Details
ρ1 Ara A
Mass 6.5 ± 1.3 [5]   M☉
Radius 4.21 ± 0.20 [6]   R☉
Luminosity 1,418 [7]   L☉
Surface gravity (log g)3.75 [8]   cgs
Temperature 19,800 [8]   K
Rotational velocity (v sin i)370 ± 10 [9]  km/s
Age 18.4 ± 1.5 [10]   Myr
ρ1 Ara B
Mass 0.53 ± 0.11 [5]   M☉
Radius 0.27 ± 0.04 [6]   R☉
Luminosity204 [6]   L☉
Temperature 42,000 [6]   K
Other designations
ρ1 Ara, V846 Arae, CD–50 10905, GC 22790, HD  152478, HIP 82868, HR 6274, NSV 8047, SAO 244280 [11]
Database references
SIMBAD data

Rho1 Arae is the Bayer designation for a star in the southern constellation of Ara. Unusually for a star with a Bayer designation, it was not catalogued by Bayer in his Uranometria . It was instead first catalogued by Nicolas Lacaille, in his Coelum Australe Stelliferum published in 1763. This star gained the Bayer designation of Rho1 Arae in Bode's Uranographia , published in 1801. Rho1 Arae is one of the dimmest stars with a Bayer designation, having an apparent visual magnitude of just +6.275 [2] According to the Bortle Dark-Sky Scale, this means the star is just barely visible to the naked eye in dark rural skies. Based upon parallax measurements, it is about 640 light-years (200 parsecs ) distant from the Sun, give or take a 50-light-year margin of error. [1]

A light curve for V846 Arae, plotted from TESS data V846AraLightCurve.png
A light curve for V846 Arae, plotted from TESS data

The Hipparcos data revealed that Rho1 Arae is a variable star. It was given its variable star designation, V846 Arae, in 1999. [13] This is a spectroscopic binary system, which means that the presence of an orbiting companion is indicated by shifts in the spectrum. The primary star is a Be star, while the secondary star is a subdwarf O star; they orbit each other with a period of about 236.50 days. [5] The combined spectrum of this system matches a stellar classification of B3 Vnpe, which may indicate the primary is a B-type main-sequence star. The 'e' suffix indicates the presence of emission lines from the primary Be star. For Rho1 Arae, the emission lines are prominent and variable. [9] The primary star is spinning rapidly with a projected rotational velocity of 370 ± 10, which makes it difficult to obtain reliable orbital elements. [9]

Rho1 Arae has a peculiar velocity of 27.4 ± 4.9 km/s relative to its neighbors, [10] making it a runaway star system. A scenario that it was ejected from the Scorpius–Centaurus OB association as a result of a past supernova explosion seems unlikely because of its binarity. [9]

Related Research Articles

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<span class="mw-page-title-main">Beta Arae</span> Star in the constellation Ara

Beta Arae, is the brightest star in the constellation of Ara. It is a very luminous, relatively young supergiant star with an apparent magnitude of 2.84 and an absolute magnitude of -3.494. It is located about 713 light-years from Earth. At this distance, its apparent magnitude is diminished by 0.193 magnitudes due to interstellar extinction between Earth and the star.

<span class="mw-page-title-main">Iota Arae</span> Star in the constellation Ara

Iota Arae, Latinized from ι Arae, is the Bayer designation for a star in the southern constellation of Ara. It is 920 light-years from Earth, give or take a 20 light-year margin of error, and has an apparent visual magnitude of 5.2. Based upon the Bortle Dark-Sky Scale, this means the star is visible to the naked eye from suburban skies.

<span class="mw-page-title-main">V539 Arae</span> Triple star system in the constellation Ara

V539 Arae (Bayer designation Nu1 Arae (ν1 Arae / ν1 Ara)) is a triple star system in the southern constellation of Ara. It is a variable star, the brightness of which varies from magnitude 5.71 to 6.24, making it faintly visible to the naked eye under good observing conditions. Based upon an annual parallax shift of 3.30 ± 0.47, this system is at a distance of roughly 1,000 light-years (310 parsecs) from Earth.

<span class="mw-page-title-main">35 Arietis</span> Star in the constellation Aries

35 Arietis is a binary star in the northern constellation of Aries. 35 Arietis is the Flamsteed designation. It is approximately 340 light-years distant from the Earth, based upon an annual parallax shift of 9.51 mas. This star is visible to the naked eye with an apparent visual magnitude of 4.64.

<span class="mw-page-title-main">V448 Carinae</span> Star in the constellation Carina

V448 Carinae is a single star in the constellation Carina. It has the Bayer designation O Carinae, while V448 Carinae is the variable star designation. This object has an orange hue and is dimly visible to the naked eye with an apparent visual magnitude that fluctuates around 5.60. It is located at a distance of approximately 680 light years from the Sun based on parallax, and is drifting further away with a radial velocity of around +26 km/s.

<span class="mw-page-title-main">RV Caeli</span> Star in the constellation Caelum

RV Caeli, also known as HD 28552, is a solitary, red hued variable star located in the southern constellation Caelum, the chisel. It has an apparent magnitude of 6.4, placing it near the limit for naked eye visibility. The object is located at a distance of 1,340 light years based on parallax measurements from Gaia DR3, but is rapidly receding with a heliocentric radial velocity of 98 km/s.

<span class="mw-page-title-main">HD 155035</span> Star in the constellation Ara

HD 155035 is a star in the constellation Ara, the Altar. It is located at a distance of approximately 1,450 light-years from Earth and has an apparent visual magnitude of 5.92, making it is faintly visible to the naked eye. This is a red giant star with a stellar classification of M1.5 III.

<span class="mw-page-title-main">HD 160342</span> Star in the constellation Ara

HD 160342 is a star in the southern constellation of Ara. HD 160342 is its Henry Draper Catalogue designation. It has an apparent visual magnitude of 6.35, making it very faintly visible to the naked eye under ideal observing conditions. Based upon parallax measurements, is approximately 960 light-years distant from Earth.

Kappa<sup>1</sup> Apodis Star in the constellation Apus

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<span class="mw-page-title-main">HD 130144</span> Star in the constellation Boötes

HD 130144 is a variable star in the northern constellation of Boötes. It has the variable star designation EK Boötis, while HD 130144 is the designation from the Henry Draper Catalogue. The star is faintly visible to the naked eye with an apparent visual magnitude that ranges from 5.33 down to 5.71. Parallax measurements provide a distance estimate of approximately 810 light years from the Sun. It is drifting closer with a radial velocity of −23 km/s.

<span class="mw-page-title-main">CQ Camelopardalis</span> Star in the constellation Camelopardalis

CQ Camelopardalis, abbreviated as CQ Cam, is a solitary variable star in the northern circumpolar constellation Camelopardalis. It has an apparent magnitude of 5.19, making it visible to the naked eye under ideal conditions. The object is relatively far at a distance of about 2,000 light years but is drifting closer with a heliocentric radial velocity of −22 km/s. It has a peculiar velocity of 21.8+2.1
−1.9 km/s, making it a runaway star.

HD 126614 is a trinary star system in the equatorial constellation of Virgo. The primary member, designated component A, is host to an exoplanetary companion. With an apparent visual magnitude of 8.81, it is too faint to be seen with the naked eye. The system is located at a distance of 239 light years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of −33 km/s.

13 Scorpii, also known by its Bayer designation c2 Scorpii, is a binary star in the constellation Scorpius. Its apparent magnitude is 4.57, meaning it can be faintly seen with the naked eye. Based on parallax estimates made by the Hipparcos spacecraft, the system is located about 480 light-years away. It is located within the Upper Scorpius subgroup of the Scorpius–Centaurus association.

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<span class="mw-page-title-main">5 Lacertae</span> Star in the constellation Lacerta

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<span class="mw-page-title-main">48 Persei</span> Star in the constellation Perseus

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<span class="mw-page-title-main">58 Persei</span> Multiple-star system in the constellation of Perseus

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<span class="mw-page-title-main">V1073 Scorpii</span> Variable star in the constellation Scorpius

V1073 Scorpii is a variable star in the constellation Scorpius. It has a non-Greek Bayer designation of k Scorpii. The star has a blue-white hue and is visible to the naked eye with an apparent visual magnitude that fluctuates around +4.87. Parallax measurements yield a distance estimate of approximately 2,920 ly (896 pc) from the Sun, and it is drifting further away with a radial velocity of +7 km/s. It has an absolute magnitude of −6.8

<span class="mw-page-title-main">HD 34989</span> Star in the constellation Orion

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References

  1. 1 2 3 4 5 6 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv: 0708.1752 , Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID   18759600.
  2. 1 2 3 4 Kozok, J. R. (September 1985), "Photometric observations of emission B-stars in the southern Milky Way", Astronomy and Astrophysics Supplement Series, 61: 387–405, Bibcode:1985A&AS...61..387K.
  3. ↑ Evans, D. S. (June 20–24, 1966), "The Revision of the General Catalogue of Radial Velocities", in Batten, Alan Henry; Heard, John Frederick (eds.), Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, vol. 30, University of Toronto: International Astronomical Union, p. 57, Bibcode:1967IAUS...30...57E.
  4. ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv: 1108.4971 , Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID   119257644.
  5. 1 2 3 4 Wang, Luqian; Gies, Douglas R.; Peters, Geraldine J.; Han, Zhanwen (April 2023). "The Orbital and Physical Properties of Five Southern Be+sdO Binary Systems". The Astronomical Journal. 165 (5): 203. arXiv: 2303.12616 . Bibcode:2023AJ....165..203W. doi: 10.3847/1538-3881/acc6ca . ISSN   1538-3881.
  6. 1 2 3 4 Wang, Luqian; Gies, Douglas R.; Peters, Geraldine J.; Götberg, Ylva; Chojnowski, S. Drew; Lester, Kathryn V.; Howell, Steve B. (2021). "The Detection and Characterization of Be+sdO Binaries from HST/STIS FUV Spectroscopy". The Astronomical Journal. 161 (5): 248. arXiv: 2103.13642 . Bibcode:2021AJ....161..248W. doi: 10.3847/1538-3881/abf144 .
  7. ↑ Hohle, M. M.; Neuhäuser, R.; Schutz, B. F. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten, 331 (4): 349, arXiv: 1003.2335 , Bibcode:2010AN....331..349H, doi:10.1002/asna.200911355, S2CID   111387483.
  8. 1 2 Soubiran, C.; Le Campion, J.-F.; Cayrel de Strobel, G.; Caillo, A. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics, 515: A111, arXiv: 1004.1069 , Bibcode:2010A&A...515A.111S, doi:10.1051/0004-6361/201014247, S2CID   118362423.
  9. 1 2 3 4 Jilinski, E.; et al. (September 2010), "A Dynamical Study of Suspected Runaway Stars as Traces of Past Supernova Explosions in the Region of the Scorpius–Centaurus OB Association", The Astrophysical Journal, 721 (1): 469–477, Bibcode:2010ApJ...721..469J, doi: 10.1088/0004-637X/721/1/469 .
  10. 1 2 Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society , 410 (1): 190–200, arXiv: 1007.4883 , Bibcode:2011MNRAS.410..190T, doi: 10.1111/j.1365-2966.2010.17434.x , S2CID   118629873.
  11. ↑ "rho01 Ara". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2012-08-01.{{cite web}}: CS1 maint: postscript (link)
  12. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
  13. ↑ Kazarovets, E. V.; Samus, N. N.; Durlevich, O. V.; Frolov, M. S.; Antipin, S. V.; Kireeva, N. N.; Pastukhova, E. N. (January 1999). "The 74th Special Name-list of Variable Stars". Information Bulletin on Variable Stars. 4659: 1. Bibcode:1999IBVS.4659....1K . Retrieved 25 November 2024.
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