V3903 Sagittarii

V3903 Sagittarii

A red-light light curve for V3903 Sagittarii, adapted from Wraight et al. (2011)[1]
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Sagittarius
Right ascension 18h 09m 17.6999s[2]
Declination −23° 59′ 18.2312″
Apparent magnitude (V) 7.00–7.45[3]
Characteristics
Spectral type O7V(n)z + B0:V:[4]
U−B color index −0.82[5]
B−V color index +0.16[5]
Variable type Algol[6]
Astrometry
Proper motion (μ) RA: +0.87±0.67[7] mas/yr
Dec.: −0.66±0.42[7] mas/yr
Parallax (π)0.8368 ± 0.0258 mas[8]
Distance3,900 ± 100 ly
(1,200 ± 40 pc)
Absolute magnitude (MV)−4.59 + −3.69[6]
Orbit[6]
Period (P)1.744204 days
Eccentricity (e)0
Inclination (i)65.20°
Semi-amplitude (K1)
(primary)		236.6 km/s
Semi-amplitude (K2)
(secondary)		339.4 km/s
Details[6]
A
Mass27.27 M☉
Radius8.088 R☉
Luminosity122,000 L☉
Surface gravity (log g)4.058 cgs
Temperature38,000 K
Rotational velocity (v sin i)230 km/s
B
Mass19.01 M☉
Radius6.125 R☉
Luminosity45,500 L☉
Surface gravity (log g)4.143 cgs
Temperature34,100 K
Rotational velocity (v sin i)170 km/s
Age1.6 Myr
Other designations
V3903 Sgr, CD−24°13962, HD 165921, HIP 88943, SAO 186366
Database references
SIMBADdata

V3903 Sagittarii (also known as 11 Sagittarii, or its abbreviation 11 Sgr) is an eclipsing binary star system in the constellation Sagittiarus. It creates an H II region LBN 29 (Sh 2-29) 1,070 parsecs (3,500 light-years) away from the Sun.[9]

John Flamsteed designated this star the Flamsteed designation 11 Sagittarii, although the designation 11 Sgr is now more often used to refer to the star he designated 1 Sagittarii.[10]

  1. ^ Cite error: The named reference Wraight was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference dr2 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference gcvs was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference gosss was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference ubv was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference vaz was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference van Leeuwen2007 was invoked but never defined (see the help page).
  8. ^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  9. ^ Arellano-Córdova, K. Z.; Esteban, C.; García-Rojas, J.; Méndez-Delgado, J. E. (2021), "On the radial abundance gradients of nitrogen and oxygen in the inner Galactic disc", Monthly Notices of the Royal Astronomical Society, 502: 225–241, arXiv:2012.06643, doi:10.1093/mnras/staa3903
  10. ^ Cite error: The named reference Wagman was invoked but never defined (see the help page).