V4199 Sagittarii

V4199 Sagittarii

A light curve for V4199 Sagittarii, plotted from Hipparcos data[1]
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Sagittarius
Right ascension 19h 21m 37.11363s[2]
Declination −19° 14′ 04.0500″[2]
Apparent magnitude (V) 6.25[3]
Characteristics
Spectral type B5III[4]
B−V color index −0.091±0.004[3]
Variable type SPB[5]
Astrometry
Radial velocity (Rv)−23.3±7.4[6] km/s
Proper motion (μ) RA: +3.135 mas/yr
Dec.: −12.136 mas/yr
Parallax (π)4.7371 ± 0.0556 mas[2]
Distance689 ± 8 ly
(211 ± 2 pc)
Absolute magnitude (MV)−0.63[3]
Details[5]
Mass4.2±0.3 M☉
Radius2.9±0.5 R☉
Luminosity316+82
−66 L☉
Surface gravity (log g)4.16±0.20 cgs
Temperature14,700±700 K
Rotational velocity (v sin i)6±4 km/s
Age48.9±21.6[7] Myr
Other designations
173 G. Sagittarii, BD−19°5412, HD 181558, HIP 95159, HR 7339, SAO 162511, WDS 19216-1914[8]
Database references
SIMBADdata

V4199 Sagittarii is a variable star in the southern constellation of Sagittarius.[8] It is a dim star that is just visible to the naked eye with an apparent visual magnitude that varies between 6.22 and 6.28 over a period of 1.23825 days.[9] The star is located at a distance of approximately 689 light years from the Sun based on parallax, but is drifting closer with a radial velocity of roughly −23 km/s.[6] It has an absolute magnitude of −0.63,[3] on average.

The stellar classification of this star is B5III,[4] matching a B-type giant star. In the Bright Star Catalogue it was listed as a main sequence star of class B5V, although the colors suggest a somewhat more evolved star.[10] The photometric variability of this star was announced by C. Waelkens and F. Rufener in 1984.[11] It is a multi-periodic[10] slowly pulsating B star with a dominant frequency of 0.80780±0.00010 cycles/day.[12] The star has four times the mass of the Sun and three times the Sun's radius. It is radiating ~316 times the luminosity of the Sun from its photosphere at an effective temperature of 14,700 K. A magnetic field has been detected on this star with a strength of −104±32 G.[5]

It has a magnitude 9.96 companion star at an angular separation of 90.9″ along a position angle of 310°, as of 2003.[13]

  1. ^ Cite error: The named reference HIPCurve was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Houk_Smith-Moore_1978 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Hubrig_et_al_2009 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Kharchenko_et_al_2007 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Tetzlaff_et_al_2011 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference simbad was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference aavso was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Waelkens1991 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Waelkens_Rufener_1985 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference DeCat_et_al_2005 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Mason_et_al_2014 was invoked but never defined (see the help page).