V4381 Sagittarii
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 18h 08m 38.58558s[1] |
| Declination | −21° 26′ 58.4136″[1] |
| Apparent magnitude (V) | 6.538[2] (6.57p - 6.62p[3]) |
| Characteristics | |
| Evolutionary stage | Supergiant[2] |
| Spectral type | A2/A3Iab[2] |
| U−B color index | +0.279[2] |
| B−V color index | −+0.856[2] |
| Variable type | α Cyg[3] |
| Astrometry | |
| Radial velocity (Rv) | −16[4] km/s |
| Proper motion (μ) | RA: −1.65[1] mas/yr Dec.: −1.05[1] mas/yr |
| Parallax (π) | 2.25 ± 0.55[1] mas |
| Distance | approx. 1,400 ly (approx. 400 pc) |
| Absolute magnitude (MV) | −6.6[5] |
| Details[2] | |
| Mass | 7.00[6] M☉ |
| Luminosity | 39,000 L☉ |
| Surface gravity (log g) | 1.50 cgs |
| Temperature | 9,000 K |
| Rotational velocity (v sin i) | 18 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
V4381 Sagittarii is a variable star in the constellation Sagittarius. A white supergiant of spectral type A2/A3Iab, it is an Alpha Cygni variable that varies between apparent magnitudes 6.57 and 6.62.
References
- 1 2 3 4 5 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
- 1 2 3 4 5 6 Firnstein, M.; Przybilla, N. (2012). "Quantitative spectroscopy of Galactic BA-type supergiants. I. Atmospheric parameters". Astronomy & Astrophysics 543: A80. arXiv:1207.0308. Bibcode:2012A&A...543A..80F. doi:10.1051/0004-6361/201219034.
- 1 2 Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S 1. Bibcode:2009yCat....102025S.
- ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
- ↑ Humphreys, R. M. (1978). "Studies of luminous stars in nearby galaxies. I. Supergiants and O stars in the Milky Way". Astrophysical Journal 38: 309. Bibcode:1978ApJS...38..309H. doi:10.1086/190559.
- ↑ Hohle, M. M.; Neuhäuser, R.; Schutz, B. F. (2010). "Masses and luminosities of O- and B-type stars and red supergiants". Astronomische Nachrichten 331 (4): 349. Bibcode:2010AN....331..349H. doi:10.1002/asna.200911355.
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