Astronomy:15 Lacertae
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Lacerta |
| Right ascension | 22h 52m 02.03323s[1] |
| Declination | +43° 18′ 44.7028″[1] |
| Apparent magnitude (V) | 4.95[2] + 11.9[3] |
| Characteristics | |
| Spectral type | M0 III[4] |
| B−V color index | 1.559±0.010[2] |
| Astrometry | |
| Radial velocity (Rv) | −19.21±0.20[2] km/s |
| Proper motion (μ) | RA: +109.890±0.214[1] mas/yr Dec.: +23.581±0.215[1] mas/yr |
| Parallax (π) | 9.6841 ± 0.1425[1] mas |
| Distance | 337 ± 5 ly (103 ± 2 pc) |
| Absolute magnitude (MV) | −0.04[2] |
| Details | |
| Radius | 37.30+0.61 −1.02[1] R☉ |
| Luminosity | 294.5±5.1[1] L☉ |
| Surface gravity (log g) | 1.352[5] cgs |
| Temperature | 3,915+55 −32[1] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
15 Lacertae is a binary star[7] system in the northern constellation of Lacerta, near the southeast constellation border with Andromeda. It is faintly visible to the naked eye with an apparent visual magnitude of 4.95.[2] The distance to this system is approximately 337 light years based on parallax.[1] It is drifting closer to the Sun with a radial velocity of −19 km/s.[2] The absolute magnitude of 15 Lacertae is −0.04.[2]
The primary component is an aging red giant with a stellar classification of M0 III.[4] With the supply of hydrogen at its core exhausted, the star has cooled and expanded to 37 times the Sun's radius. It is radiating 295 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 3,915 K,[1] giving it a reddish hue.
The secondary companion was discovered by American astronomer S. W. Burnham in 1888. It has a visual magnitude of 11.9 and is located at an angular separation of 23.6″ from the primary along a position angle of 159°, as of 2014.[3]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 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.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 Mason, B. D. et al. (2014). "The Washington Visual Double Star Catalog". The Astronomical Journal 122 (6): 3466. doi:10.1086/323920. Bibcode: 2001AJ....122.3466M.
- ↑ 4.0 4.1 Abt, H. A. (September 1985), "Visual multiples. VIII - 1000 MK types", Astrophysical Journal Supplement Series 59: 95–112, doi:10.1086/191064, Bibcode: 1985ApJS...59...95A
- ↑ Ghosh, Supriyo et al. (April 2019). "Spectral calibration of K-M giants from medium-resolution near-infrared HK-band spectra". Monthly Notices of the Royal Astronomical Society 484 (4): 4619–4634. doi:10.1093/mnras/stz299. Bibcode: 2019MNRAS.484.4619G.
- ↑ "15 Lac". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=15+Lac.
- ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society 389 (2): 869–879. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E.
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