Astronomy:Theta Lyrae
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Short description: Star in a trinary star system in the constellation Lyra
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Lyra |
| Right ascension | 19h 16m 22.0951s[1] |
| Declination | +38° 08′ 01.431″[1] |
| Apparent magnitude (V) | 4.38[2] |
| Characteristics | |
| Spectral type | K0II[3] |
| U−B color index | +1.23[2] |
| B−V color index | +1.26[2] |
| Astrometry | |
| Radial velocity (Rv) | −31.05±0.14[1] km/s |
| Proper motion (μ) | RA: −2.864[1] mas/yr Dec.: 4.114[1] mas/yr |
| Parallax (π) | 4.2005 ± 0.1053[1] mas |
| Distance | 755.9+21.9 −20.2 ly (237.9+6.7 −6.2 pc) |
| Absolute magnitude (MV) | −2.76+0.27 −0.24[3] |
| Details | |
| Radius | 60.31+1.92 −2.99[4] R☉ |
| Luminosity | 1,374±43[4] L☉ |
| Surface gravity (log g) | 1.93[3] cgs |
| Temperature | 4,523±44[4] K |
| Metallicity [Fe/H] | −0.01[3] dex |
| Rotational velocity (v sin i) | 3.6±1.4[3] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Theta Lyrae (θ Lyr) is a red giant star in the constellation Lyra, approximately 760 light years away from Earth.
Theta Lyrae is an orange bright giant star of the spectral type K0II, which means that it possesses a surface temperature of about 5,000 K, and is many times bigger and brighter, yet cooler, than the Sun.
BD+37°3399 and BD+37°3399B are respectively 10th- and 11th-magnitude companions, although not at the same distance. BD+37°3399 is a giant star with a spectral type of K2III. It is therefore almost the same temperature as Theta Lyrae.[6] BD+37° 3399B is an 11th magnitude star of an unknown spectral type.[7]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". Vizier Online Data Catalog 2237. Bibcode: 2002yCat.2237....0D.
- ↑ 3.0 3.1 3.2 3.3 3.4 Carney, Bruce W. et al. (March 2008). "Rotation and Macroturbulence in Metal-Poor Field Red Giant and Red Horizontal Branch Stars". The Astronomical Journal 135 (3): 892–906. doi:10.1088/0004-6256/135/3/892. Bibcode: 2008AJ....135..892C.
- ↑ 4.0 4.1 4.2 Baines, Ellyn K.; Clark, ((James H., III)); Schmitt, Henrique R.; Stone, Jordan M.; von Braun, Kaspar (2023-12-01). "33 New Stellar Angular Diameters from the NPOI, and Nearly 180 NPOI Diameters as an Ensemble". The Astronomical Journal 166 (6): 268. doi:10.3847/1538-3881/ad08be. ISSN 0004-6256. Bibcode: 2023AJ....166..268B.
- ↑ "* tet Lyr". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+tet+Lyr.
- ↑ "BD+37 3399". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=BD%2B37+3399.
- ↑ "Simbad Query Result". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Simbad+Query+Result.
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