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.
| 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] |
| Distance | 689 ± 8 ly (211 ± 2 pc) |
| Absolute magnitude (MV) | −0.63[3] |
| Details[5] | |
| Mass | 4.2±0.3 M☉ |
| Radius | 2.9±0.5 R☉ |
| Luminosity | 316+82 −66 L☉ |
| Surface gravity (log g) | 4.16±0.20 cgs |
| Temperature | 14,700±700 K |
| Rotational velocity (v sin i) | 6±4 km/s |
| Age | 48.9±21.6[7] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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]
References
edit- ^ "Light Curve". Hipparcos ESA. ESA. Retrieved 17 February 2022.
- ^ a b c Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c d Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
- ^ a b Houk, Nancy; Smith-Moore, M. (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. Vol. 4. Ann Arbor: Dept. of Astronomy, University of Michigan. Bibcode:1988mcts.book.....H.
- ^ a b c Hubrig, S.; et al. (April 2009). "New magnetic field measurements of β Cephei stars and slowly pulsating B stars". Astronomische Nachrichten. 330 (4): 317. arXiv:0902.1314. Bibcode:2009AN....330..317H. doi:10.1002/asna.200811187. S2CID 17497112.
- ^ a b Kharchenko, N. V.; et al. (2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889. arXiv:0705.0878. Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776. S2CID 119323941.
- ^ Tetzlaff, N.; et al. (January 2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410 (1): 190–200. arXiv:1007.4883. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x. S2CID 118629873.
- ^ a b "V* V4199 Sgr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 12 August 2013.
- ^ Otero, Sebastian (10 February 2012). "V4199 Sgr". The International Variable Star Index. Retrieved 14 July 2014.
- ^ a b Waelkens, C. (June 1991). "Slowly pulsating B stars". Astronomy and Astrophysics. 246: 453. Bibcode:1991A&A...246..453W.
- ^ Waelkens, C.; Rufener, F. (November 1985). "Photometric variability of mid-B stars". Astronomy and Astrophysics. 152: 6–14. Bibcode:1985A&A...152....6W.
- ^ De Cat, P.; et al. (March 2005). "A study of bright southern slowly pulsating B stars. III. Mode identification for singly-periodic targets in spectroscopy". Astronomy and Astrophysics. 432 (3): 1013–1024. Bibcode:2005A&A...432.1013D. doi:10.1051/0004-6361:20042103. hdl:2066/33307.
- ^ Mason, B. D.; et al. (2014). "The Washington Visual Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi:10.1086/323920.