Astronomy:13 Delphini

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Short description: Double star in the constellation Delphinus
13 Delphini
Observation data
{{#ifeq:J2000.0 (ICRS)|J2000.0 (ICRS)|Epoch J2000.0      Equinox J2000.0 (ICRS)| [[History:Epoch|Epoch J2000.0 (ICRS)]]      [[Astronomy:Equinox (celestial coordinates)|Equinox J2000.0 (ICRS)}}
Constellation Delphinus
A
Right ascension  20h 47m 48.3330s[1]
Declination +06° 00′ 29.551″[1]
Apparent magnitude (V) 5.66[2]
B
Right ascension  20h 47m 48.3012s[3]
Declination +06° 00′ 28.127″[3]
Apparent magnitude (V) 8.51[2]
Characteristics
A
Evolutionary stage main sequence[4]
Spectral type A0 V[5]
U−B color index −0.09[6]
B−V color index −0.01[6]
Astrometry
Radial velocity (Rv)−7±4.3[7] km/s
Absolute magnitude (MV)−0.01[8]
A
Proper motion (μ) RA: +8.255[1] mas/yr
Dec.: −13.162[1] mas/yr
Parallax (π)6.9265 ± 0.0489[1] mas
Distance471 ± 3 ly
(144 ± 1 pc)
B
Proper motion (μ) RA: +5.663 mas/yr
Dec.: −12.280 mas/yr
Parallax (π)6.6697 ± 0.0989[3] mas
Distance489 ± 7 ly
(150 ± 2 pc)
Details
A
Mass2.51+0.31−0.36[9] M☉
Radius3.7±0.4[9] R☉
Luminosity119+20−17[4] L☉
Surface gravity (log g)3.69+0.61−0.69[9] cgs
Temperature9,840+91−90[4] K
Metallicity [Fe/H]0.00[10] dex
Rotational velocity (v sin i)170[11] km/s
Age307[10] Myr
B
Mass1.5[12] M☉
Surface gravity (log g)3.90[12] cgs
Temperature6,449[12] K
Other designations
13 Del, BD+05°4613, GC 28986, HD 198069, HIP 102633, HR 7953, SAO 126222, WDS J20478+0600A
Database references
SIMBADdata

13 Delphini is a binary star[2] in the northern constellation of Delphinus, with a combined apparent magnitude of 5.64.[13] The system is located at a distance of 471 light years but is approaching the Solar System with a heliocentric radial velocity of about −7 km/s.[7]

13 Delphini A has an apparent magnitude of 5.66, while its companion has an apparent magnitude of 8.51.[2] As of 2016, the pair have a separation of 1.5″ located at a position angle of 200°.[14]

13 Delphini has a blended stellar classification of A0 V,[5] indicating that it is an ordinary A-type main-sequence star. However, when the components are analysed individually, the primary star is given a class of B9V.[15] It has 2.51 times the mass of the Sun[9] and has an effective temperature of 9,840 K.[4] However, the star is large for its class, having a radius almost 4 times that of the Sun[9] and a luminosity 119 times greater.[4] This is due to 13 Delphini having completed 86.1% of its main sequence lifetime[4] and has led one source to classify it as a subgiant instead.[16] It spins rapidly with a projected rotational velocity of 170 km/s[11] and has an age of 307 million years.[10]

This star has been designated Lambda Delphini by Johann Elert Bode, but the designation is generally unused now.[17]

References

  1. ↑ 1.0 1.1 1.2 1.3 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society 389 (2): 869–879. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E. 
  3. ↑ 3.0 3.1 3.2 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics 537: A120. doi:10.1051/0004-6361/201117691. ISSN 0004-6361. Bibcode: 2012A&A...537A.120Z. 
  5. ↑ 5.0 5.1 Paunzen, E.; Duffee, B.; Heiter, U.; Kuschnig, R.; Weiss, W. W. (July 2001). "A spectroscopic survey for λ Bootis stars". Astronomy & Astrophysics (EDP Sciences) 373 (2): 625–632. doi:10.1051/0004-6361:20010630. ISSN 0004-6361. Bibcode: 2001A&A...373..625P. 
  6. ↑ 6.0 6.1 Cousins, A. W. J. (1971). "Photometric standard stars". Royal Observatory Annals 7: 86. Bibcode: 1971ROAn....7.....C. 
  7. ↑ 7.0 7.1 Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. ISSN 1063-7737. Bibcode: 2006AstL...32..759G. 
  8. ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation" (in en). Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A. 
  9. ↑ 9.0 9.1 9.2 9.3 9.4 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256. Bibcode: 2019AJ....158..138S. 
  10. ↑ 10.0 10.1 10.2 Gontcharov, G. A. (December 2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters 38 (12): 771–782. doi:10.1134/S1063773712120031. ISSN 0320-0108. Bibcode: 2012AstL...38..771G. 
  11. ↑ 11.0 11.1 Royer, F.; Zorec, J.; Gómez, A. E. (23 November 2006). "Rotational velocities of A-type stars". Astronomy & Astrophysics 463 (2): 671–682. doi:10.1051/0004-6361:20065224. ISSN 0004-6361. Bibcode: 2007A&A...463..671R. 
  12. ↑ 12.0 12.1 12.2 Anders, F.; Khalatyan, A.; Queiroz, A. B. A.; Chiappini, C.; Ardèvol, J.; Casamiquela, L.; Figueras, F.; Jiménez-Arranz, Ó. et al. (2022). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia EDR3 stars brighter than G = 18.5". Astronomy and Astrophysics 658: A91. doi:10.1051/0004-6361/202142369. Bibcode: 2022A&A...658A..91A. 
  13. ↑ Fabricius, C.; Høg, E.; Makarov, V. V.; Mason, B. D.; Wycoff, G. L.; Urban, S. E. (2002-03-01). "The Tycho double star catalogue". Astronomy and Astrophysics 384: 180–189. doi:10.1051/0004-6361:20011822. ISSN 0004-6361. Bibcode: 2002A&A...384..180F. 
  14. ↑ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal 122 (6): 3466–3471. doi:10.1086/323920. ISSN 0004-6256. Bibcode: 2001AJ....122.3466M. 
  15. ↑ Palmer, D. R.; Walker, E. N.; Jones, D. H. P.; Wallis, R. E. (1968). "The radial velocities spectral types and projected rotational velocities of 633 bright northern A stars.". Royal Greenwich Observatory Bulletins 135: 385. Bibcode: 1968RGOB..135..385P. 
  16. ↑ 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. doi:10.1086/192182. ISSN 0067-0049. Bibcode: 1995ApJS...99..135A. 
  17. ↑ Wagman, Morton (2003). Lost Stars: Lost, Missing and Troublesome Stars from the Catalogues of Johannes Bayer, Nicholas Louis de Lacaille, John Flamsteed, and Sundry Others. Blacksburg, VA: The McDonald & Woodward Publishing Company. p. 460. ISBN 978-0-939923-78-6. Bibcode: 2003lslm.book.....W. 



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