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Double star in the constellation Delphinus
13 Delphini is a
binary star
[2] in the equatorial
constellation
Delphinus , with a combined
apparent magnitude of 5.64.
[12] 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 .
[6]
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
° .
[13]
13 Delphini has a blended
stellar classification of A0 V,
[4] 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.
[14] It has 2.51 times the
mass of the Sun
[9] and has an
effective temperature of 9,840
K .
[3] 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.
[3] This is due to 13 Delphini having completed 86.1% of its
main sequence lifetime
[3] and has led one source to classify it as a
subgiant instead.
[15] It spins rapidly with a
projected rotational velocity of 170
km/s
[11] and has an age of 307
million years .
[10]
References
^
a
b
c
d
e
f
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S2CID
227254300 . (Erratum:
doi :
10.1051/0004-6361/202039657e ) .
Gaia EDR3 record for this source at
VizieR .
^
a
b
c
d Eggleton, P. P.; Tokovinin, A. A. (September 2008).
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^
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f Zorec, J.; Royer, F. (January 2012).
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arXiv :
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doi :
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ISSN
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S2CID
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^
a
b Paunzen, E.; Duffee, B.; Heiter, U.; Kuschnig, R.; Weiss, W. W. (July 2001).
"A spectroscopic survey for λ Bootis stars" . Astronomy & Astrophysics . 373 (2). EDP Sciences: 625–632.
Bibcode :
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^
a
b Cousins, A. W. J. (1971). "Photometric standard stars". Royal Observatory Annals . 7 : 86.
Bibcode :
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^
a
b 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.
arXiv :
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ISSN
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^ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters . 38 (5): 331–346.
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^
a
b
Brown, A. G. A. ; et al. (Gaia collaboration) (2021).
"Gaia Early Data Release 3: Summary of the contents and survey properties" .
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doi :
10.1051/0004-6361/202039657 .
S2CID
227254300 . (Erratum:
doi :
10.1051/0004-6361/202039657e ) .
Gaia EDR3 record for this source at
VizieR .
^
a
b
c
d
e Stassun, Keivan G.; et al. (9 September 2019).
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arXiv :
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Bibcode :
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doi :
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ISSN
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^
a
b
c Gontcharov, G. A. (December 2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters . 38 (12): 771–782.
arXiv :
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ISSN
0320-0108 .
S2CID
255201789 .
^
a
b Royer, F.; Zorec, J.; Gómez, A. E. (23 November 2006).
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^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 2001).
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^ 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.
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