HD 197630

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HD 197630
HD 197630 is the star circled in red
Observation data
Epoch J2000      Equinox J2000
Constellation Microscopium[1]
Right ascension 20h 46m 20.06779s[2]
Declination −39° 11′ 57.3590″[2]
Apparent magnitude (V) 5.47±0.01[3]
Characteristics
Evolutionary stage main sequence[4]
Spectral type B8/9 V[5]
B−V color index −0.10[6]
Variable type suspected SPB[7]
Astrometry
Radial velocity (Rv)−30±7.4[8] km/s
Proper motion (μ) RA: +50.451 mas/yr[2]
Dec.: −27.196 mas/yr[2]
Parallax (π)9.9354±0.1022 mas[2]
Distance328 ± 3 ly
(101 ± 1 pc)
Absolute magnitude (MV)+0.49[1]
Details
Mass2.83±0.04[4] M☉
Radius2.56±0.13[9] R☉
Luminosity73.5[10] L☉
Surface gravity (log g)4.11±0.14[11] cgs
Temperature10,965+255
−250[12] K
Metallicity59% solar
Metallicity [Fe/H]−0.23[13] dex
Rotational velocity (v sin i)290[14] km/s
Age113[11] Myr
Other designations
23 G. Microscopii[15], CD−39°13960, CPD−39°8771, FK5 3658, GC 28927, HD 197630, HIP 102497, HR 7933, SAO 212416[16]
Database references
SIMBADdata

HD 197630, also known as HR 7933 or rarely 23 G. Microscopii, is a probable astrometric binary located in the southern constellation of Microscopium. The visible component is a bluish-white hued star that is faintly visible to the naked eye with an apparent magnitude of 5.47.[3] Based on parallax measurements from the Gaia satellite, the system is estimated to be 328 light years away.[2] However, it is drifting closer with a heliocentric radial velocity of −30 km/s. At its current distance, HD 197630's brightness is diminished by 0.11 magnitudes due to interstellar dust.[17] A 2012 multiplicity survey failed to confirm the velocity variations.[18]

HD 197630 has a stellar classification of B8/9 V,[5] indicating that it is a B-type star with the characteristics of a B8 and B9 main sequence star. It has 2.83 times the mass of the Sun[4] and 2.56 times the Sun's radius. It radiates 73.5 times the luminosity of the Sun[10] from its photosphere at an effective temperature of 10,965 K.[12] The star is estimated to be 113 million years old,[11] having completed roughly half of its main sequence lifetime.[4] HD 19730 is spinning rapidly with a projected rotational velocity of 290 km/s.[14]

File:HD197630LightCurve.png
A light curve for HD 197630, plotted from TESS data[19]

The object was in a 2002 Hipparcos variability survey and as a result,[20] the AAVSO cataloged HD 197630 as a suspected variable star that fluctuates by 0.005 magnitudes within 7.71 hours.[21] However, subsequent observations have not confirmed this. Further data from the Transiting Exoplanet Survey Satellite suggests that HD 197630 may be a slowly pulsating B-type star plus a variable star with rotation modulations.[7]

References

[edit | edit source]
  1. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). XHIP record for this object at VizieR.
  2. ^ a b c d e Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Gaia DR3 record for this source at VizieR.
  3. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  4. ^ a b c d Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  5. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  6. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  7. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  8. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  9. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  10. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  11. ^ a b c Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  12. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  13. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  14. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  15. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  16. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  17. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  18. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  19. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  20. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  21. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
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