Lambda Andromedae
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 Location of λ Andromedae (upper right). |
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| Observation data Epoch J2000 Equinox J2000 |
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|---|---|
| Constellation | Andromeda |
| Right ascension | 23h 37m 33.8425s |
| Declination | +46° 27′ 29.347″ |
| Apparent magnitude (V) | 3.81[1] |
| Characteristics | |
| Spectral type | G8 III[1] |
| U−B color index | 0.69 |
| B−V color index | +1.08[1] |
| Variable type | RS CVn type |
| Astrometry | |
| Radial velocity (Rv) | 6.8 km/s |
| Proper motion (μ) | RA: 159.22 mas/yr Dec.: -421.46 mas/yr |
| Parallax (π) | 38.74 ± 0.68 mas |
| Distance | 84 ± 1 ly (25.8 ± 0.5 pc) |
| Details | |
| Radius | 7.4 ± 0.2[2] R☉ |
| Luminosity | 27[1] L☉ |
| Surface gravity (log g) | 3.11[1] |
| Temperature | 4,694[1] K |
| Metallicity [Fe/H] | –0.56[1] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Database references | |
| SIMBAD | data |
Lambda Andromedae (λ And, λ Andromedae) is a binary star in the constellation Andromeda. It is approximately 84.2 light years from Earth.
Lambda Andromedae is a spectroscopic binary with an orbital period of 20.52 days. It is classified as a yellow G-type giant with a mean apparent magnitude of +3.81. The binary system is an RS Canum Venaticorum variable and its brightness varies from magnitude +3.69 to +3.97 with a period of 54.2 days.
[edit] References
- ^ a b c d e f g Mallik, Sushma V. (December 1999), "Lithium abundance and mass", Astronomy and Astrophysics 352: 495–507, Bibcode 1999A&A...352..495M
- ^ Nordgren, Tyler E. et al. (December 1999), "Stellar Angular Diameters of Late-Type Giants and Supergiants Measured with the Navy Prototype Optical Interferometer", The Astronomical Journal 118 (6): 3032-3038, Bibcode 1999AJ....118.3032N, doi:10.1086/301114
[edit] External links
- http://www.mfc-cs.com/space/stars/hip116584.htm
- http://www.alcyone-software.com/cgi-bin/search.pl?object=HR8961
- Image Lambda Andromedae
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