HD 149989

HD 149989

A light curve of HD 149989 from Hipparcos data, assuming a period of 0.4266 days, adapted from Aerts et al. (1998)[1]
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Ara
Right ascension	16^h 40^m 44.39899^s[2]
Declination	−51° 28′ 41.7258″[2]
Apparent magnitude (V)	6.30[3]
Characteristics
Spectral type	A9 V[4] or F1 V nn m-4[5]
B−V color index	0.321±0.006[6]
Variable type	γ Dor[3]
Astrometry
Radial velocity (Rv)	45.9±0.5[7] km/s
Proper motion (μ)	RA: +11.741[2] mas/yr Dec.: +131.264[2] mas/yr
Parallax (π)	19.5759 ± 0.0521 mas[2]
Distance	166.6 ± 0.4 ly (51.1 ± 0.1 pc)
Absolute magnitude (MV)	2.83[6]
Details
Mass	1.60[8] M☉
Radius	1.70+0.08 −0.12[2] R☉
Luminosity	6.27±0.02[2] L☉
Surface gravity (log g)	4.21±0.14[8] cgs
Temperature	7,003+257 −159[2] K
Rotational velocity (v sin i)	136[9] km/s
Age	1.144[8] Gyr
Other designations
V872 Arae, NSV 20726, CD–51°10403, CPD–51°9815, HD 149989, HIP 81650, SAO 244058[10]
Database references
SIMBAD	data

HD 149989 is a single,[3] 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.[3] 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.[7]

HD 149989 was discovered to be a variable star when the data from the Hipparcos mission was analyzed. The discovery was published in 1997, in the list of periodic variables seen by that satellite.[11] In 1998, Conny Aerts et al. sifted through that list, and determined that HD 149989 is a Gamma Doradus type star.[1] It has a period of 0.42658 days.[3] It was given its variable star designation in March 2000.[12]

This object is an A-type main-sequence star with a stellar classification of A9 V.[4] A 2016 survey of γ Doradus stars found a class of F1 V nn m-4, where the 'nn' indicates "nebulous" lines due to rapid rotation and the 'm-4' means a metal-poor star with metal lines that match a class of A7.[5] It is around 1.1[8] billion years old and is spinning with a projected rotational velocity of 136 km/s.[9]

References

1. Aerts, C.; Eyer, L.; Kestens, E. (September 1998). "The discovery of new gamma Doradus stars from the HIPPARCOS mission". Astronomy & Astrophysics. 337: 790–796. Bibcode:1998A&A...337..790A. Retrieved 26 October 2021.
2. 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. De Cat, P.; et al. (April 2006), "A spectroscopic study of southern (candidate) γ Doradus stars. I. Time series analysis", Astronomy and Astrophysics, 449 (1): 281–292, arXiv:astro-ph/0511207, Bibcode:2006A&A...449..281D, doi:10.1051/0004-6361:20053655, S2CID 119518208
4. Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
5. Kahraman Aliçavuș, F.; et al. (May 2016), "Spectroscopic survey of γ Doradus stars - I. Comprehensive atmospheric parameters and abundance analysis of γ Doradus stars", Monthly Notices of the Royal Astronomical Society, 458 (3): 2307–2322, arXiv:1602.06514, Bibcode:2016MNRAS.458.2307K, doi:10.1093/mnras/stw393, S2CID 16477998.
6. 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.
7. 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. 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.
9. Royer, F.; et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224, S2CID 18475298.
10. "V872 Ara". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-02-04.
11. ESA (1997). The Hipparcos and Tycho catalogues. Astrometric and photometric star catalogues derived from the ESA Hipparcos Space Astrometry Mission. Noordwijk, Netherlands: ESA Publications Division. Bibcode:1997ESASP1200.....E. Retrieved 27 November 2024.
12. Kazarovets, E. V.; Samus, N. N.; Durlevich, O. V. (March 2000). "The 75th Name-List of Variable Stars" (PDF). Information Bulletin on Variable Stars. 4870: 1–47. Bibcode:2000IBVS.4870....1K. Retrieved 26 November 2024.

External links

• HIP 81650
• Image HD 149989