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 16h 40m 44.39899s[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]
Distance166.6 ± 0.4 ly
(51.1 ± 0.1 pc)
Absolute magnitude (MV)2.83[6]
Details
Mass1.60[8] M☉
Radius1.70+0.08
−0.12[2] R☉
Luminosity6.27±0.02[2] L☉
Surface gravity (log g)4.21±0.14[8] cgs
Temperature7,003+257
−159[2] K
Rotational velocity (v sin i)136[9] km/s
Age1.144[8] Gyr
Other designations
V872 Arae, NSV 20726, CD–51°10403, CPD–51°9815, HD 149989, HIP 81650, SAO 244058[10]
Database references
SIMBADdata

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]

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] This is a confirmed variable star of the Gamma Doradus type with a period of 0.42658 days.[3] It is around 1.1[8] billion years old and is spinning with a projected rotational velocity of 136 km/s.[9]

  1. ^ Cite error: The named reference Aerts was invoked but never defined (see the help page).
  2. ^ a b c d e f g h Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference aaa449_1_281 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference houk1978 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Aliçavuș2016 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference David2015 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference aaa463_2_671 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).