Astronomy:b Persei
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Short description: Star in the constellation Perseus
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Perseus |
| Right ascension | 04h 18m 14.61690s[1] |
| Declination | +50° 17′ 43.8058″[1] |
| Apparent magnitude (V) | 4.52 - 4.68[2] |
| Characteristics | |
| Spectral type | A1III[3] |
| B−V color index | +0.04[4] |
| Variable type | Ellipsoidal[2] |
| Astrometry | |
| Radial velocity (Rv) | 19.8±0.9[5] km/s |
| Proper motion (μ) | RA: 45.42±0.40[1] mas/yr Dec.: −56.72±0.32[1] mas/yr |
| Parallax (π) | 10.40 ± 0.35[1] mas |
| Distance | 310 ± 10 ly (96 ± 3 pc) |
| Absolute magnitude (MV) | 0.3[6] |
| Orbit[7] | |
| Primary | A or Aa |
| Companion | C or Ac |
| Period (P) | 701.76 days |
| Semi-major axis (a) | 5.09 mas |
| Eccentricity (e) | 0.235 |
| Inclination (i) | 83.46° |
| Longitude of the node (Ω) | 115.29° |
| Periastron epoch (T) | 2440143.3984 |
| Argument of periastron (ω) (secondary) | 263° |
| Details | |
| A or Aa | |
| Mass | 2.25[6] M☉ |
| Radius | 3.2[8] R☉ |
| Luminosity | 10[9] L☉ |
| Temperature | 9000[6] K |
| Rotational velocity (v sin i) | 81[10] km/s |
| B or Ab | |
| Mass | 0.56[11] M☉ |
| Radius | 0.25[8] R☉ |
| C or Ac | |
| Mass | 1.24[11] M☉ |
| Luminosity | 2[9] L☉ |
| Other designations | |
BD+49°1150, GC 5174, HD 26961, HR 1324, HIP 20070, SAO 24531 | |
| Database references | |
| SIMBAD | data |
Light curves for b Persei. The top panel, plotted from TESS data,[12] shows the variability of the inner binary pair. The lower panels, plotted from AAVSO data,[13] show two eclipses.
b Persei (also known as HD 26961) is a spectroscopic triple star in the constellation Perseus. Its apparent magnitude is 4.60,[6] and it is about 320 light years away.[1]
In addition to the primary, an A-type giant, there is a smaller and cooler companion in a 1.53 day orbit, probably an F-class star around absolute magnitude 3.0, and a more distant companion (star C or Ac) in an orbit calculated to be 702 days long.[6] The close binary pair forms a rotating ellipsoidal variable with a 1.53 day period. Star C forms an Algol-type variable system with the close binary, showing both primary eclipses (when star C passes in front of the inner pair) and secondary eclipses (when the inner pair passes in front of star C).[14] Timings of the eclipses show a 705.4-day period.[9]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V. Vizier catalog entry
- ↑ 2.0 2.1 Samus, N. N. et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S 1. Bibcode: 2009yCat....102025S.
- ↑ Abt, Helmut A. (2009). "MK Classifications of Spectroscopic Binaries". The Astrophysical Journal Supplement 180 (1): 117–18. doi:10.1088/0067-0049/180/1/117. Bibcode: 2009ApJS..180..117A.
- ↑ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. Vizier catalog entry
- ↑ Wilson, R. E. (1953). General Catalogue of Stellar Radial Velocities. Carnegie Institution for Science. Bibcode: 1953GCRV..C......0W.
- ↑ 6.0 6.1 6.2 6.3 6.4 Hill, G.; Aikman, G. C. L.; Cowley, A. P.; Bolton, C. T.; Thomas, J. C. (1976). "The radio-flaring triple system B Per". The Astrophysical Journal 208: 152. doi:10.1086/154590. Bibcode: 1976ApJ...208..152H.
- ↑ ESA (1997). "The Hipparcos and Tycho Catalogues". VizieR On-line Data Catalog 1239. Bibcode: 1997yCat.1239....0E.
- ↑ 8.0 8.1 Duerbeck, H. W.; Schettler, A. (1979). "Photometric and spectroscopic study of the ellipsoidal variable b Persei". Acta Astronomica 29: 225. Bibcode: 1979AcA....29..225D.
- ↑ 9.0 9.1 9.2 "Alert Notice 791: Anticipated secondary eclipse of b Per centered on September 29 2022 UT". https://www.aavso.org/aavso-alert-notice-791.
- ↑ Royer, F. (2007). "Rotational velocities of A-type stars. III. Velocity distributions". Astronomy and Astrophysics 463 (2): 671–682. doi:10.1051/0004-6361:20065224. Bibcode: 2007A&A...463..671R.
- ↑ 11.0 11.1 Tokovinin, Andrei (23 February 2018). "The Updated Multiple Star Catalog". The Astrophysical Journal Supplement Series 235 (1): 6. doi:10.3847/1538-4365/aaa1a5. Bibcode: 2018ApJS..235....6T.
- ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html.
- ↑ "Download Data". AAVSO. https://www.aavso.org/data-download.
- ↑ "b Per". AAVSO. https://www.aavso.org/vsx/index.php?view=detail.top&oid=26212.
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