Astronomy:V4199 Sagittarii
| Observation data Epoch J2000.0 Equinox (celestial coordinates) | |
|---|---|
| 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[2] mas |
| 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 |
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]
References
- ↑ "Light Curve". ESA. https://www.cosmos.esa.int/web/hipparcos/java-tools/light-curve.
- ↑ 2.0 2.1 2.2 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 3.0 3.1 3.2 3.3 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 4.0 4.1 Houk, Nancy; Smith-Moore, M. (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. 4. Ann Arbor: Dept. of Astronomy, University of Michigan. Bibcode: 1988mcts.book.....H.
- ↑ 5.0 5.1 5.2 Hubrig, S. et al. (April 2009). "New magnetic field measurements of β Cephei stars and slowly pulsating B stars". Astronomische Nachrichten 330 (4): 317. doi:10.1002/asna.200811187. Bibcode: 2009AN....330..317H.
- ↑ 6.0 6.1 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. doi:10.1002/asna.200710776. Bibcode: 2007AN....328..889K.
- ↑ 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. doi:10.1111/j.1365-2966.2010.17434.x. Bibcode: 2011MNRAS.410..190T.
- ↑ 8.0 8.1 "V* V4199 Sgr". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=V%2A+V4199+Sgr.
- ↑ Otero, Sebastian (10 February 2012). "V4199 Sgr". The International Variable Star Index. http://www.aavso.org/vsx/index.php?view=detail.top&oid=31899.
- ↑ 10.0 10.1 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. doi:10.1051/0004-6361:20042103. Bibcode: 2005A&A...432.1013D.
- ↑ Mason, B. D. et al. (2014). "The Washington Visual Double Star Catalog". The Astronomical Journal 122 (6): 3466–3471. doi:10.1086/323920. Bibcode: 2001AJ....122.3466M.
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