1 Delphini

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1 Delphini
Delphinus constellation map.svg
Red circle.svg
Location of 1 Delphini (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Delphinus
A
Right ascension 20h 30m 17.9623s [1]
Declination +10° 53′ 45.335″ [1]
Apparent magnitude  (V)6.20±0.01 [2]
B
Right ascension 20h 30m 17.9505s [3]
Declination +10° 53′ 46.244″ [3]
Apparent magnitude  (V)8.00±0.01 [2]
Characteristics
Spectral type A1:III shell [4]
U−B color index −0.11 [5]
B−V color index −0.03 [5]
Astrometry
Radial velocity (Rv)−15.5 ± 2 [6]  km/s
Absolute magnitude  (MV)−0.69 [7]
A
Proper motion (μ)RA: +19.320  mas/yr [1]
Dec.: +4.645  mas/yr [1]
Parallax (π)4.6400 ± 0.0616  mas [1]
Distance 703 ± 9  ly
(216 ± 3  pc)
B
Proper motion (μ)RA: +19.545 [3]   mas/yr
Dec.: +4.710 [3]   mas/yr
Parallax (π)4.1851 ± 0.1421  mas [3]
Distance 780 ± 30  ly
(239 ± 8  pc)
Details
A
Mass 3.1±0.3 [8]   M☉
Surface gravity (log g)3.66±0.77 [8]   cgs
Temperature 10,651+932
−1156 [8]   K
Metallicity [Fe/H]0.00 [9]   dex
Rotational velocity (v sin i)217 [10]  km/s
Age 246 [9]   Myr
B
Surface gravity (log g)4.14+0.19
−0.47 [8]   cgs
Rotational velocity (v sin i)370 [10]  km/s
Other designations
1 Delphini, BD+10°4303, HD  195325, HIP  101160, HR  7836, SAO  106172, WDS J20303+1054AB
Database references
SIMBAD data

1 Delphini (1 Del) is the Flamsteed designation for a close binary star in the equatorial constellation Delphinus. With a combined apparent magnitude of 6.08, it is barely visible to the naked eye, even under ideal conditions. Parallax measurements put the components at a distance 703 and 780 light years respectively. However, its approaching the Solar System with a radial velocity of 15  km/s .

1 Del consists of three components. The brightest of them has a magnitude of 6.1; a companion located around 0.9 arcseconds from the primary has an apparent magnitude of 8.1; and a third star, located much farther away at around 17 arcseconds from component A, is the faintest with a magnitude of around 14 and is an unrelated background object. [11]

The entire system has a stellar classification of A1: III sh, indicating that it is a white giant + a shell star. However, there is some uncertainty about the temperature class. When resolved, the secondary has a class of B9. 1 Del A has 3 times the mass of the Sun and an effective temperature of 10,651 K, [8] giving it a bluish white glow. It is estimated to be almost 250 million years old and has a solar metallicity. [9] Both components spin rapidly, with projected rotational velocities of 217 and 370 km/s respectively. [10] As for the peculiarities, the shell star is a primary component; the spectrum of the secondary shows broad absorption lines. [10]

Due to the stability of the emission lines data from 1 Delphini has been used for developing models of shell stars and Be stars. [10]

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References

  1. 1 2 3 4 5 Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics . 649: A1. arXiv: 2012.01533 . Bibcode:2021A&A...649A...1G. doi: 10.1051/0004-6361/202039657 . S2CID   227254300. (Erratum:  doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  2. 1 2 Fabricius, C.; Høg, E.; Makarov, V. V.; Mason, B. D.; Wycoff, G. L.; Urban, S. E. (March 2002). "The Tycho double star catalogue". Astronomy & Astrophysics. 384 (1): 180–189. Bibcode:2002A&A...384..180F. doi: 10.1051/0004-6361:20011822 . ISSN   0004-6361.
  3. 1 2 3 4 5 Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics . 649: A1. arXiv: 2012.01533 . Bibcode:2021A&A...649A...1G. doi: 10.1051/0004-6361/202039657 . S2CID   227254300. (Erratum:  doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  4. ↑ 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 . ISSN   0067-0049.
  5. 1 2 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.
  6. ↑ Ralph Elmer Wilson (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication. Carnegie Institution of Washington. Bibcode:1953GCRV..C......0W. LCCN   54001336.
  7. ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN   1063-7737. S2CID   255204555.
  8. 1 2 3 4 5 Anders, F.; et al. (February 2022). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia EDR3 stars brighter than G = 18.5". Astronomy & Astrophysics. 658: A91. arXiv: 2111.01860 . Bibcode:2022A&A...658A..91A. doi: 10.1051/0004-6361/202142369 . ISSN   0004-6361.
  9. 1 2 3 Gontcharov, G. A. (December 2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771–782. arXiv: 1606.08814 . Bibcode:2012AstL...38..771G. doi:10.1134/S1063773712120031. ISSN   0320-0108. S2CID   255201789.
  10. 1 2 3 4 5 Kubát, Jiří; Kubátová, Brankica; Doležalová, Barbora; Iliev, Lubomir; Šlechta, Miroslav (2016). "Spectroscopy of close visual binary components of the stable shell star 1 Delphini". Astronomy and Astrophysics. 587: A22. arXiv: 1601.05236 . Bibcode:2016A&A...587A..22K. doi:10.1051/0004-6361/201526414. S2CID   118706088.
  11. ↑ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics . 649: A1. arXiv: 2012.01533 . Bibcode:2021A&A...649A...1G. doi: 10.1051/0004-6361/202039657 . S2CID   227254300. (Erratum:  doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.

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