Astronomy:V424 Lacertae
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Lacerta |
| Right ascension | 22h 56m 25.997s[1] |
| Declination | +49° 44′ 00.716″[1] |
| Apparent magnitude (V) | +4.94[2] |
| Characteristics | |
| Spectral type | K5 Ib[3] |
| U−B color index | +1.95[2] |
| B−V color index | +1.77[2] |
| Variable type | Lc[4] |
| Astrometry | |
| Radial velocity (Rv) | −9.50[5] km/s |
| Proper motion (μ) | RA: −0.709 ± 0.298[6] mas/yr Dec.: −2.317 ± 0.294[6] mas/yr |
| Parallax (π) | 1.5762 ± 0.1858[6] mas |
| Distance | approx. 2,100 ly (approx. 630 pc) |
| Details | |
| Mass | 6.8[7] M☉ |
| Radius | 274+4 −3[8] R☉ |
| Luminosity | 13,100 - 14,200[1] L☉ |
| Surface gravity (log g) | +0.50[7] cgs |
| Temperature | 3,790[1] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
V424 Lacertae (V424 Lac) is a red supergiant variable star in the constellation Lacerta. It is a member of the Lacerta OB1 stellar association.
The MK spectral type of V424 Lac has been determined to be K5,[3] but it has also been classified as M0.[10] It was discovered to be slightly variable using analysis of Hipparcos photometry. The total range is less than a tenth of a magnitude.[11] Multiple short periods are detected, as well as slow variations with a period of 1,100 or 1,601 days. Although listed in the General Catalogue of Variable Stars as a slow irregular variable, it has been considered to be either a semiregular variable or long secondary period variable.[9]
There is an ultraviolet excess from V424 Lacertae, that may be due to an unseen companion, which could also explain the long secondary period. On this assumption, a sub-stellar companion in a 1,382 day 6.2 AU orbit has been suggested.[7]
References
- ↑ 1.0 1.1 1.2 1.3 Messineo, M.; Brown, A. G. A. (2019). "A Catalog of Known Galactic K-M Stars of Class I Candidate Red Supergiants in Gaia DR2". The Astronomical Journal 158 (1): 20. doi:10.3847/1538-3881/ab1cbd. Bibcode: 2019AJ....158...20M.
- ↑ 2.0 2.1 2.2 Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues 2237: 0. Bibcode: 2002yCat.2237....0D.
- ↑ 3.0 3.1 Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series 71: 245. doi:10.1086/191373. Bibcode: 1989ApJS...71..245K.
- ↑ Samus, N. N. 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): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G.
- ↑ 6.0 6.1 6.2 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.
- ↑ 7.0 7.1 7.2 Lee, B.-C.; Han, I.; Park, M.-G.; Hatzes, A. P.; Kim, K.-M. (2014). "Low-amplitude and long-period radial velocity variations in giants HD 3574, 63 Cygni, and HD 216946". Astronomy & Astrophysics 566: A124. doi:10.1051/0004-6361/201321863. Bibcode: 2014A&A...566A.124L.
- ↑ Norris, Ryan P. (2019). Seeing Stars Like Never Before: A Long-term Interferometric Imaging Survey of Red Supergiants (PDF) (PhD). Georgia State University.
- ↑ 9.0 9.1 Messina, Sergio (2007). "Evidence for the pulsational origin of the Long Secondary Periods: The red supergiant star V424 Lac (HD 216946)". New Astronomy 12 (7): 556–561. doi:10.1016/j.newast.2007.04.002. Bibcode: 2007NewA...12..556M.
- ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedlevesque - ↑ Kazarovets, E. V.; Samus, N. N.; Durlevich, O. V.; Frolov, M. S.; Antipin, S. V.; Kireeva, N. N.; Pastukhova, E. N. (1999). "The 74th Special Name-list of Variable Stars". Information Bulletin on Variable Stars 4659: 1. Bibcode: 1999IBVS.4659....1K.
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