1 Delphini
1 Delphini is a shell star with stable emission lines in the constellation of Delphinus. 1 Delphini consists of three components. 1 Delphini A, the brightest of them, has a magnitude of 6.1; 1 Delphini B located around 0.9 arcsecconds from 1 Delphini A has an apparent magnitude of 8.1; and 1 Delphini C located much farther away at around 17 arcseconds from component A is the faintest with a magnitude of around 14. Due to the stability of the emission lines data from 1 Delphini has been used for developing models of shell stars and Be stars.[5]
  1 Delphini
| |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Delphinus |
| Right ascension | 20h 30m 17.96064s[1] |
| Declination | +10° 53′ 45.3233″[1] |
| Apparent magnitude (V) | 6.08[2] |
| Characteristics | |
| Spectral type | A1 III[3] |
| B−V color index | −0.03[2] |
| Astrometry | |
| Radial velocity (Rv) | −15.5 ± 2[4] km/s |
| Proper motion (μ) | RA: 16.12[1] mas/yr Dec.: 3.10[1] mas/yr |
| Parallax (π) | 4.39 ± 0.69[1] mas |
| Distance | approx. 700 ly (approx. 230 pc) |
| Details | |
| Rotational velocity (v sin i) | 200[3] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
References
- Van Leeuwen, Floor (2007). "Validation of the new Hipparcos reduction". Astronomy & Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
- Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
- Abt, Helmut A.; Morrell, Nidia I. (July 1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". The Astrophysical Journal Supplement Series. 99: 135. Bibcode:1995ApJS...99..135A. doi:10.1086/192182.
- Ralph Elmer Wilson (1953). General Catalogue of Stellar Radial Velocities. Carnegie Institution of Washington. Bibcode:1953GCRV..C......0W. LCCN 54001336.
- Kubát, Jiří; Kubátová, Brankica; Doležalová, Barbora; Iliev, Lubomir; Šlechta, Miroslav (1 March 2016). "Spectroscopy of close visual binary components of the stable shell star 1 Delphini". Astronomy & Astrophysics. 587: A22. arXiv:1601.05236. Bibcode:2016A&A...587A..22K. doi:10.1051/0004-6361/201526414.
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