45 Andromedae
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda[1] |
| Right ascension | 01h 11m 10.2771s[2] |
| Declination | +37° 43′ 26.848″[2] |
| Apparent magnitude (V) | 5.80[1] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | B7 III-IV[3] |
| B−V color index | −0.095±0.004[1] |
| Astrometry | |
| Radial velocity (Rv) | −1.5±1.0[4] km/s |
| Proper motion (μ) | RA: −15.844[2] mas/yr Dec.: −5.486[2] mas/yr |
| Parallax (π) | 4.9479±0.0555 mas[2] |
| Distance | 659 ± 7 ly (202 ± 2 pc) |
| Absolute magnitude (MV) | −1.10[1] |
| Details | |
| Mass | 3.30[5] M☉ |
| Radius | 4.24[6] R☉ |
| Luminosity | 156[5] L☉ |
| Surface gravity (log g) | 3.93[7] cgs |
| Temperature | 12,078[5] K |
| Metallicity [Fe/H] | −0.47[7] dex |
| Rotational velocity (v sin i) | 60[8] km/s |
| Other designations | |
| 45 And, BD+36°201, HD 7019, HIP 5550, HR 348, SAO 54494, PPM 66038, WDS J01112+3743AB[9] | |
| Database references | |
| SIMBAD | data |
45 Andromedae, abbreviated 45 And, is a double star[10] in the northern constellation Andromeda. 45 Andromedae is the Flamsteed designation. Its combined apparent visual magnitude is 5.80.[1] Based upon an annual parallax shift of 4.95 mas,[2] it is located 659 light years away.
The stellar classification of 45 And is B7 III-IV,[3] matching an evolving subgiant/giant star. It has about 4.2 times the Sun's radius[6] and is radiating 156 times the Sun's luminosity from its photosphere at an effective temperature of 12,078 K.[5]
This star is most likely single. A companion star was discovered by American astronomer George W. Hough in 1890. As of 2006, the companion was at an angular separation of 0.10″ along a position angle of 225° from the primary.[10]
References
- ^ a b c d e Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
- ^ a b c d e f g 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.
- ^ a b Cowley, A. (November 1972), "Spectral classification of the bright B8 stars", Astronomical Journal, 77: 750–755, Bibcode:1972AJ.....77..750C, doi:10.1086/111348.
- ^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
- ^ a b c d Quintana, Alexis L.; Wright, Nicholas J.; Martínez García, Juan (2025). "A census of OB stars within 1 KPC and the star formation and core collapse supernova rates of the Milky Way". Monthly Notices of the Royal Astronomical Society. 538 (3): 1367. arXiv:2503.08286. Bibcode:2025MNRAS.538.1367Q. doi:10.1093/mnras/staf083.
- ^ a b Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3. Proper-motion anomaly and resolved common proper-motion pairs". Astronomy and Astrophysics. 657. arXiv:2109.10912. Bibcode:2022A&A...657A...7K. doi:10.1051/0004-6361/202142146.
- ^ a b Das, Pradosh Barun; Zucker, Daniel B.; De Silva, Gayandhi M.; Borsato, Nicholas W.; Mura-Guzmán, Aldo; Buder, Sven; Ness, Melissa; Nordlander, Thomas; Casey, Andrew R.; Martell, Sarah L.; Bland-Hawthorn, Joss; De Grijs, Richard; Freeman, Ken C.; Kos, Janez; Stello, Dennis; Lewis, Geraint F.; Hayden, Michael R.; Sharma, Sanjib (2025). "The GALAH Survey: Stellar parameters and abundances for 800 000 Gaia RVS spectra using GALAH DR4 and the Cannon". Monthly Notices of the Royal Astronomical Society. 538 (2): 605. arXiv:2410.12272. Bibcode:2025MNRAS.538..605D. doi:10.1093/mnras/staf169.
- ^ Strom, Stephen E.; et al. (2005), "B Star Rotational Velocities in h and χ Persei: A Probe of Initial Conditions during the Star Formation Epoch?", The Astronomical Journal, 129 (2): 809–828, arXiv:astro-ph/0410337, Bibcode:2005AJ....129..809S, doi:10.1086/426748, S2CID 15059129.
- ^ "45 And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 28, 2018.
- ^ a b Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.