Theta Lyrae
Appearance
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Lyra |
Right ascension | 19h 16m 22.0951s / 19h 16m 30.069s / 19h 16m 28.7s |
Declination | +38° 8' 1.431" / +38° 8' 35.80" / +38° 7' 1" |
Apparent magnitude (V) | 4.347 / 9.5 / 11.0 |
Characteristics | |
Spectral type | K0II[1] + K2III + ? |
U−B color index | +1.23[citation needed] |
B−V color index | +1.25[citation needed] |
Astrometry | |
Radial velocity (Rv) | −31.05±0.14[2] km/s |
Proper motion ( | RA: −2.864 mas/yr[2] Dec.: 4.114 mas/yr[2] |
Parallax ( | 4.2005 ± 0.1053 mas[2] |
Distance | 755.6+21.8 −20.2 ly (237.9+6.7 −6.2 pc)[3] |
Absolute magnitude (MV) | −2.76+0.27 −0.24[1] |
Details | |
Radius | 60.31+1.92 −2.99[4] R☉ |
Luminosity | 1,374±43[4] L☉ |
Surface gravity (log g) | 1.93[1] cgs |
Temperature | 4,523±44[4] K |
Metallicity [Fe/H] | −0.01[1] dex |
Rotational velocity (v sin i) | 3.6±1.4[1] km/s |
Other designations | |
Database references | |
SIMBAD | data |
Theta Lyrae (
It is orbited by a subsystem composed of BD+37° 3399 and BD+37° 3399B. 10th magnitude BD+37° 3399 is a giant star with a spectral type of K2III. It is therefore almost the same temperature as Theta Lyrae, but smaller and dimmer.[6] BD+37° 3399B is an 11th magnitude star of an unknown spectral type.[7]
References
[edit]- ^ a b c d e 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, arXiv:0711.4984, Bibcode:2008AJ....135..892C, doi:10.1088/0004-6256/135/3/892, S2CID 2756572
- ^ a b c Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ Bailer-Jones, C. A. L.; Rybizki, J.; Fouesneau, M.; Demleitner, M.; Andrae, R. (2021). "Estimating Distances from Parallaxes. V. Geometric and Photogeometric Distances to 1.47 Billion Stars in Gaia Early Data Release 3". The Astronomical Journal. 161 (3): 147. arXiv:2012.05220. Bibcode:2021AJ....161..147B. doi:10.3847/1538-3881/abd806. S2CID 228063812. Data about this star can be seen here.
- ^ a b c 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. Bibcode:2023AJ....166..268B. doi:10.3847/1538-3881/ad08be. ISSN 0004-6256.
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: CS1 maint: multiple names: authors list (link) - ^ "* tet Lyr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 15, 2007.
- ^ a b "BD+37 3399". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 15, 2007.
- ^ a b "Simbad Query Result". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 15, 2007.