R Normae

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R Normae
RNorLightCurve.png
The visual band light curve of R Normae, from AAVSO data [1]
Observation data
Epoch J2000       Equinox J2000
Constellation Norma
Right ascension 15h 35m 57.35429s [2]
Declination −49° 30′ 28.6817″ [2]
Apparent magnitude  (V)7.69 [3] (6.5–12.8) [4]
Characteristics
Spectral type M3-7 [5]
U−B color index +1.33 [3]
B−V color index +1.77 [3]
Variable type Mira [5]
Astrometry
Radial velocity (Rv)−22.0 [6]  km/s
Proper motion (μ)RA: −0.63 [2]   mas/yr
Dec.: −7.09 [2]   mas/yr
Parallax (π)1.72 ± 2.79 [2]   mas
Distance 2,900  ly (900  pc) [7]   ly
Details
Luminosity 7,764 [8]   L☉
Temperature 3,161 [8]   K
Other designations
R  Nor, CD−49°9787, GC  20939, GSC  08304-00824, HD  138743, HIP  76377, HIC  76377, SAO  225948. [9]
Database references
SIMBAD data

R Normae is a Mira variable star located near Eta Normae [10] in the southern constellation of Norma. This is an intermediate-mass red giant star that is generating part of its energy through hydrogen fusion. Because this fusion is thought to be occurring under conditions of convection, it is generating an excess of lithium. [11] The star ranges from magnitude 6.5 to 12.8 and has a relatively long period of 496 days. [4] Located around 2,900 [7] light-years distant, it shines with a luminosity 7764 times that of the Sun and has a surface temperature of 3161 K. [8]

Related Research Articles

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Sigma Sculptoris, Latinized from σ Sculptoris, is a solitary, white-hued star in the southern constellation of Sculptor. It is faintly visible to the naked eye with an apparent visual magnitude of +5.54. Based upon an annual parallax shift of 14.04 mas as seen from Earth, it is located about 232 light years from the Sun.

Xi Telescopii, Latinized from ξ Telescopii, is a solitary star in the southern constellation of Telescopium. It is visible to the naked eye, with an apparent visual magnitude of +4.95. Based upon an annual parallax shift of 3.02 mas as measured from Earth, it is located approximately 1,100 light years from the Sun.

Kappa Trianguli Australis Variable star in the constellation Triangulum Australe

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Theta Ursae Minoris Suspected binary star in the constellation Ursa Minor

Theta Ursae Minoris, Latinized from θ Ursae Minoris, is a suspected binary star system that is visible to the naked eye in the northern circumpolar constellation of Ursa Minor. It is roughly 860 light years from Earth with an apparent visual magnitude of 5.0. The system is moving closer to the Sun with a radial velocity of −25 km/s.

Upsilon2 Cancri is a faint, yellow-hued star in the zodiac constellation of Cancer. It is near the lower brightness limit of stars that can be viewed with the naked eye, having an apparent visual magnitude of +6.35. Based upon an annual parallax shift of 5.1325 mas as seen from our orbit, this system is roughly 635 light years away.

Delta<sup>1</sup> Canis Minoris Star in the constellation Canis Minor

Delta1 Canis Minoris, Latinized from δ1 Canis Minoris, is a solitary, yellow-white hued star in the constellation Canis Minor. It is faintly visible to the naked eye with an apparent visual magnitude of +5.25. Based upon an annual parallax shift of 4.29 mas as seen from Earth, this star is located roughly 760 light years from the Sun.

S Orionis

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R Lyrae

R Lyrae is a 4th magnitude semiregular variable star in the constellation Lyra, approximately 350 light years away from Earth. It is a red giant star of the spectral type M5III, meaning it has a surface temperature of under 3,500 kelvins. It is much larger and brighter, yet cooler, than the Sun. In the near-infrared J band, it is brighter than the nearby Vega.

Tau2 Hydrae is a probable astrometric binary star system in the equatorial constellation of Hydra. Based upon an annual parallax shift of 6.30 mas as seen from Earth, it is located around 520 light years from the Sun. The brighter component is visible to the naked eye with an apparent visual magnitude of +4.56.

Epsilon Normae, Latinised from ε Normae, is a blue-white hued triple star system in the southern constellation of Norma. It has an apparent visual magnitude of 4.47, which is bright enough to be seen with the naked eye. Based upon an annual parallax shift of 6.15 mas as seen from Earth, the system is located around 530 light years distant from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.21 due to interstellar dust.

Delta Normae, Latinized from δ Normae, is a star system in the southern constellation of Norma. It is visible to the naked eye with an apparent visual magnitude of 4.74. Based upon an annual parallax shift of 26.66 mas as seen from Earth, the system is located about 122 light years distant from the Sun.

Omicron<sup>1</sup> Orionis Star in the constellation Orion

Omicron1 Orionis is a binary star in the northeastern corner of the constellation Orion. It is visible to the naked eye with an apparent visual magnitude of 4.7. Based upon an annual parallax shift of 5.01±0.71 mas, it is located approximately 650 light years from the Sun. At that distance, the visual magnitude of the star is diminished by an interstellar absorption factor of 0.27 due to intervening dust.

83 Ursae Majoris is a candidate binary star system in the northern circumpolar constellation of Ursa Major. This is a semiregular variable star, like Mira; for that reason it has been given the variable star designation IQ Ursae Majoris. It ranges in brightness from apparent visual magnitude 4.69 to 4.75. Percy and Au (1994) identified it as a small amplitude red variable with an irregular behavior, having a characteristic time scale of 20 days. Based upon an annual parallax shift of 6.23±0.22 mas, it is located roughly 520 light years from the Sun. The system is moving closer with a heliocentric radial velocity of −18.6 km/s.

R Leonis Minoris Variable star in the constellation Leo Minor

R Leonis Minoris is a Mira variable type star in the constellation Leo Minor. It ranges between apparent magnitude 6.3 and 13.2, and spectral types M6.5e to M9.0e (Tc:), over a period of 372 days.

T Normae Variable star in the constellation Norma

T Normae is a Mira variable star. It is located midway between Eta Normae and Gamma Circini. It ranges from magnitude 6.2 to 13.6 and a period of 244 days. Located around 900 light-years distant, it shines with a luminosity 760 times that of the Sun and has a surface temperature of 3234 K.

U Microscopii Variable star in the constellation Microscopium

U Microscopii is a Mira variable star in the constellation Microscopium. It ranges from magnitude 7 to 14.4 over a period of 334 days. The Astronomical Society of Southern Africa in 2003 reported that observations of U Microscopii were very urgently needed as data on its light curve was incomplete.

1 Lyncis is a single star in the northern constellation of Lynx. It is also known by its variable star designation of UW Lyncis; 1 Lyncis is the Flamsteed designation. This object is visible to the naked eye as a faint, reddish-hued star with an apparent visual magnitude of 4.95. It is moving further from the Earth with a heliocentric radial velocity of 12 km/s.

R Octantis Variable star in the constellation Octans

R Octantis is a Mira variable star located in the southern constellation of Octans. It shines with a luminosity 9304 times that of the Sun and has a surface temperature of 2571 K.

ψ Leonis, is a solitary star located in the zodiac constellation of Leo, to the east-northeast of Regulus. It is faintly visible to the naked eye with an apparent visual magnitude of 5.38. Based upon stellar parallax measurements, it is located around 95 light years from the Sun. At that distance, the visual magnitude of the star is diminished by an absorption factor of 0.3 due to interstellar dust.

References

  1. ↑ "Download Data". aavso.org. AAVSO. Retrieved 1 October 2021.
  2. 1 2 3 4 5 van Leeuwen, F. (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. Vizier catalog entry
  3. 1 2 3 Landolt, A. U. (October 1973). "UBV observations of long-period variable stars, VIII". Publications of the Astronomical Society of the Pacific. 85: 625. Bibcode:1973PASP...85..625L. doi: 10.1086/129515 .
  4. 1 2 Watson, Christopher (12 March 2014). "R Normae". AAVSO Website. American Association of Variable Star Observers . Retrieved 21 March 2015.
  5. 1 2 Uttenthaler, S.; van Stiphout, K.; Voet, K.; van Winckel, H.; et al. (2011). "The evolutionary state of Miras with changing pulsation periods". Astronomy & Astrophysics. 531: A88. arXiv: 1105.2198 . Bibcode:2011A&A...531A..88U. doi:10.1051/0004-6361/201116463. S2CID   56226953.
  6. ↑ Turon, C.; et al. (July 1993). "Version 2 of the HIPPARCOS Input Catalogue". Bulletin Inf. Cent. Donnees Astron. Strasbourg. 43: 5. Bibcode:1993BICDS..43....5T.
  7. 1 2 Whitelock, Patricia; Marang, Freddy; Feast, Michael (December 2000). "Infrared colours for Mira-like long-period variables found in the (M-dot <~ 10−7 M☉ yr−1) Hipparcos Catalogue". Monthly Notices of the Royal Astronomical Society. 319 (3): 728–758. Bibcode:2000MNRAS.319..728W. doi: 10.1046/j.1365-8711.2000.03743.x .
  8. 1 2 3 McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental Parameters and Infrared Excesses of Hipparcos Stars". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–57. arXiv: 1208.2037 . Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. S2CID   118665352.
  9. ↑ "V* R Normae -- Variable Star of Mira Ceti type". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 21 March 2015.
  10. ↑ Arnold, H.J.P; Doherty, Paul; Moore, Patrick (1999). The Photographic Atlas of the Stars. Boca Raton, Florida: CRC Press. p. 176. ISBN   978-0-7503-0654-6.
  11. ↑ Uttenthaler, S.; et al. (2012). "Lithium destruction and production observed in red giant stars". Memorie della Societa Astronomica Italiana Supplement. 22: 56. arXiv: 1206.2759 . Bibcode:2012MSAIS..22...56U.


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