HD 49976

Last updated
HD 49976
V592MonLightCurve.png
A light curve for V592 Monocerotis, plotted from TESS data [1]
Observation data
Epoch J2000.0        Equinox J2000.0
Constellation Monoceros
Right ascension 06h 50m 42.30314s [2]
Declination –08° 02′ 27.5937″ [2]
Apparent magnitude  (V)6.16 to 6.32 [3]
Characteristics
Spectral type A2p Sr Cr Eu [4] or B9V [5]
U−B color index +0.02 [6]
B−V color index +0.00 [6]
Variable type α2 CVn [3]
Astrometry
Radial velocity (Rv)+19.2±2.4 [7]  km/s
Proper motion (μ)RA: –9.794 [2]   mas/yr
Dec.: +2.720 [2]   mas/yr
Parallax (π)9.6666 ± 0.0529  mas [2]
Distance 337 ± 2  ly
(103.4 ± 0.6  pc)
Absolute magnitude  (MV)+1.13 [8]
Details [8]
Mass 2.21±0.11  M☉
Radius 2.3±0.3  R☉
Luminosity 32  L☉
Surface gravity (log g)4.04±0.13  cgs
Temperature 9,016  K
Rotation 2.976 days
Rotational velocity (v sin i)31 [9]  km/s
Age 209 [10]   Myr
Other designations
V592 Monocerotis, BD−07°1592, HD  49976, HIP  32838, HR  2534, SAO  133761 [11]
Database references
SIMBAD data

HD 49976 is a variable star in the constellation of Monoceros (the Unicorn). It has the variable star designation V592 Monocerotis, while HD 49976 is the identifier from the Henry Draper Catalogue . [11] It has a white hue and is near the lower limit of visibility to the naked eye, having an apparent visual magnitude that fluctuates from 6.16 down to 6.32 with a 2.976 day period. [3] Based upon parallax measurements, it is located at a distance of approximately 337  light years from the Sun. [2] The star is drifting further away with a radial velocity of +19 km/s. [7]

This is a magnetic chemically peculiar star with a stellar classification of A2p Sr Cr Eu, [4] showing excesses in strontium and the rare earth elements in the photosphere, among others. Houk and Swift (1999) assigned it a class of B9V, matching a B-type main sequence star. [5] It is an Alpha2 Canum Venaticorum variable; [3] the magnetic field is complex; not corresponding to a simple dipole. [12]

HD 49976 is an estimated 209 [10]  million years old and is spinning with a period of 2.976 days. [8] The star has 2.2 times the mass of the Sun and 2.3 times the Sun's radius. It is radiating 32 times the luminosity of the Sun from its photosphere at an effective temperature of 9,016 K. [8]

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<span class="mw-page-title-main">70 Aquarii</span> Star in the constellation Aquarius

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<span class="mw-page-title-main">20 Aquilae</span> Star in the constellation Aquila

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22 Aquilae, abbreviated 22 Aql, is a star in the equatorial constellation of Aquila. 22 Aquilae is its Flamsteed designation. It is a faint star but visible to the naked eye with an apparent visual magnitude of 5.59. The distance to 22 Aql can be estimated from its annual parallax shift of 4.74 mas, which yields a separation of 690 light years. It is moving closer to the Earth with a heliocentric radial velocity of −23 km/s.

<span class="mw-page-title-main">HD 92063</span> Star in the constellation Carina

HD 92063 is a single star in the southern constellation of Carina. It has the Bayer designation t1 Carinae, while HD 92063 is the star's identifier from the Henry Draper Catalogue. This is a suspected variable star and is visible to the naked eye with an apparent visual magnitude of 5.08. The star is located at a distance of approximately 246 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −10 km/s. Although it appears at the edge of the Carina Nebula, it is much closer than the nebula. It is also not considered a member of the nearby Alessi 5 open cluster of stars.

HD 100825 is a single star in the southern constellation of Centaurus. It has the Bayer designation C2 Centauri, while HD 100825 is the identifier from the Henry Draper catalogue. The star has a yellow-white hue and is dimly visible to the naked eye with an apparent visual magnitude of +5.26. It is located at a distance of 187 light years from the Sun based on parallax, with an absolute magnitude of +1.31. The radial velocity is poorly constrained, but the star appears to be drifting further away from the Sun at the rate of around 5 km/s. It is a member of the Sirius supercluster of co-moving stars.

<span class="mw-page-title-main">HD 4778</span> Star in the constellation Andromeda

HD 4778, also known as HR 234 and GO Andromedae, is a variable star in the constellation Andromeda. Its magnitude varies by 0.04 magnitudes from the median of 6.12 with a period of approximately 2.55 days. The star is located 350 light years away, as determined from its annual parallax shift of 9.32 mas.

<span class="mw-page-title-main">HD 149989</span> Star in the constellation Ara

HD 149989 is a single, variable star in the southern constellation of Ara, located near the western constellation border with Norma. It has the variable star designation V872 Arae, while HD 149989 is the identifier from the Henry Draper Catalogue. This is a dim star near the lower limit of visibility to the naked eye with an apparent visual magnitude that fluctuates around 6.30. It is located at a distance of 167 light years from the Sun based on parallax, and is drifting further away with a radial velocity of 46 km/s.

Mu2 Chamaeleontis (μ2 Cha) is a star located in the constellation Chamaeleon. It is not bright enough to be readily visible to the naked eye, having an apparent visual magnitude of 6.60, but has an absolute magnitude of 0.59. The distance to this object is approximately 556 light years, based on the star's parallax. The star's radial velocity is poorly constrained, but it appears to be drifting further away at the rate of around +3 km/s.

HD 201507, also designated HR 8095, is a white-hued star located in the equatorial constellation Equuleus. It has an apparent magnitude of 6.43, placing it near the limit for naked eye visibility. Parallax measurements place the object at a distance of 214 light years and it is currently drifting closer with a heliocentric radial velocity of −43 km/s.

<span class="mw-page-title-main">64 Eridani</span> Single, yellow-white hued star in the constellation Eridanus

64 Eridani is a single, yellow-white hued star in the constellation Eridanus having variable star designation S Eridani. It is faintly visible to the naked eye with an apparent visual magnitude of 4.77. The annual parallax shift is measured at 12.01 mas, which equates to a distance of about 272 light years. In addition to its proper motion, it is moving closer to the Sun with a radial velocity of around −9 km/s.

HD 32309 is a single star in the southern constellation of Lepus. It has a blue-white hue and is visible to the naked eye with an apparent visual magnitude of 4.91. The distance to this object is 197 light years based on parallax. It is drifting further away from the Sun with a radial velocity of +24 km/s. This is a member of the Columba association of co-moving stars.

HD 125442 is a single star in the southern constellation of Lupus. Its apparent visual magnitude is 4.78, which can be seen with the naked eye. The distance to HD 125442, as determined from its annual parallax shift of 22.1 mas, is 147 light years.

<span class="mw-page-title-main">28 Monocerotis</span> Star in the constellation Monoceros

28 Monocerotis is a single star in the equatorial constellation of Monoceros. It has an orange-hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.69. The distance to this star is approximately 450 light years based on parallax, and it has an absolute magnitude of −1.00. The star is drifting further away from the Sun with a radial velocity of +26.7 km/s.

HD 163376 is a single star in the southern constellation of Scorpius. It has a ruddy hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.88. The distance to this star, as determined using parallax measurements, is approximately 450 light years. It is drifting further from the Sun with a radial velocity of about 4 km/s. The absolute magnitude of this star is −0.82.

HD 95370 is a single star in the southern constellation of Vela. With an apparent visual magnitude of 4.37, it can be viewed with the naked eye. The distance to this star can be determined from its annual parallax shift of 17.2 mas, yielding a value of 190 light years. It is moving closer to the Earth with a heliocentric radial velocity of −3.5 km/s.

<span class="mw-page-title-main">47 Capricorni</span> Star in the constellation Capricornus

47 Capricorni is a variable star located around 1,170 light years from the Sun in the southern constellation Capricornus, near the northern border with Aquarius. It has the variable star designation of AG Capricorni and a Bayer designation of c2 Capricorni; 47 Capricorni is the Flamsteed designation. This object is visible to the naked eye as a dim, red-hued point of light with an apparent visual magnitude that varies between 5.90 and 6.14. The star is receding from the Earth with a heliocentric radial velocity of +20 km/s.

<span class="mw-page-title-main">TU Corvi</span> Star in the constellation Corvus

TU Corvi is a yellow-white hued star in the southern constellation of Corvus. It is a dimly visible to the naked eye with an apparent visual magnitude of 6.20. The distance to this star can be estimated from its annual parallax shift of 13.3 mas, yielding a range of about 246 light years. Based upon measured changes in its proper motion, it may be a close binary system.

<span class="mw-page-title-main">HD 56405</span> Star in the constellation Canis Major

HD 56405 is a star in the southern constellation of Canis Major. It is white in hue and is dimly visible to the naked eye with an apparent visual magnitude of 5.45. To the east of HD 56405 is the open cluster NGC 2360, also known as Caroline's Cluster. The distance to HD 56405, as determined from parallax measurements, is approximately 249 light years. It is drifting further away with a radial velocity (RV) of about +6 km/s. Although classed as a single star, it is to suspected to vary in RV.

References

  1. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
  2. 1 2 3 4 5 6 Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics . 616. A1. arXiv: 1804.09365 . Bibcode: 2018A&A...616A...1G . doi: 10.1051/0004-6361/201833051 . Gaia DR2 record for this source at VizieR.
  3. 1 2 3 4 Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID   125853869.
  4. 1 2 Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819
  5. 1 2 Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey, 5, Bibcode:1999MSS...C05....0H.
  6. 1 2 Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J
  7. 1 2 Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv: 1606.08053 , Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065, S2CID   119231169.
  8. 1 2 3 4 North, P. (June 1998), "Do SI stars undergo any rotational braking?", Astronomy and Astrophysics, 334: 181–187, arXiv: astro-ph/9802286 , Bibcode:1998A&A...334..181N
  9. ↑ Royer, F.; et al. (October 2002), "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i", Astronomy and Astrophysics, 393: 897–911, arXiv: astro-ph/0205255 , Bibcode:2002A&A...393..897R, doi:10.1051/0004-6361:20020943, S2CID   14070763
  10. 1 2 David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv: 1501.03154 , Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID   33401607.
  11. 1 2 "V592 Mon". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2018-06-06.
  12. ↑ Glagolevskij, Yu. V.; et al. (October 2013), "Features of calcium and strontium distribution on the surface of CP star HD49976", Astrophysical Bulletin, 68 (4): 454–460, Bibcode:2013AstBu..68..454G, doi:10.1134/S1990341313040068, S2CID   123119210
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