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Am star in the constellation Delphinus.
HD 195479 , also designated as HR 7839 , is a solitary
star located in the northern
constellation
Delphinus , the dolphin. It has an
apparent magnitude of 6.20,
[2] placing it near the limit for
naked eye visibility, even under
ideal conditions . The object is located relatively close at a distance of 288
light-years based on
Gaia DR3
parallax measurements
[1] and it is drifting closer with a heliocentric
radial velocity of −40.1
km/s .
[5] At its current distance, HD 195479's brightness is diminished by an
interstellar extinction of 0.27
magnitudes
[14] and it has an
absolute magnitude of +1.53.
[6]
HD 195479 is an
Am star with a
stellar classification of kA1hA9mF2.
[3] The notion indicates that it has the
calcium K-lines of an A1 star, the
hydrogen lines of an A9 star, and the
metallic lines of a F2 star. It has 2.05 times the
mass of the Sun
[7] and 2.15 times the
radius of the Sun .
[8] It radiates 38.96 times the
luminosity of the Sun
[1] from its
photosphere at an
effective temperature of 8,454
K ,
[10] giving it white hue when viewed in the
night sky . HD 195479 is deficient in
iron , having an abundance 77.6% of the
Sun 's.
[11] It is estimated to be 631
million years old
[12] and it spins modestly with a
projected rotational velocity of 18.0
km/s ,
[9] common for Am stars.
The star has two optical companions: a 12th magnitude star designated B located 5.7" away along a
position angle of 88° and a 13th magnitude star designated C located 55.9" away along a position angle of 206°.
[15] They were both observed by American
astronomer
Sherburne Wesley Burnham during the late 19th century.
[16] B and C are both background stars that are far more distant than HD 195479.
[17]
[18]
References
^
a
b
c
d
e
f
g Vallenari, A.; et al. (Gaia collaboration) (2023).
"Gaia Data Release 3. Summary of the content and survey properties" . Astronomy and Astrophysics . 674 : A1.
arXiv :
2208.00211 .
Bibcode :
2023A&A...674A...1G .
doi :
10.1051/0004-6361/202243940 .
S2CID
244398875 .
Gaia DR3 record for this source at
VizieR .
^
a
b 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 .
eISSN
1432-0746 .
ISSN
0004-6361 .
^
a
b 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 .
S2CID
120495962 .
^
a
b Mendoza, E. E.; Gomez, V. T.; Gonzalez, S. (June 1978).
"UBVRI photometry of 225 AM stars" . The Astronomical Journal . 83 : 606.
Bibcode :
1978AJ.....83..606M .
doi :
10.1086/112242 .
S2CID
121449759 .
^
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 :
1606.08053 .
Bibcode :
2006AstL...32..759G .
doi :
10.1134/S1063773706110065 .
eISSN
1562-6873 .
ISSN
1063-7737 .
S2CID
119231169 .
^
a
b 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 .
eISSN
1562-6873 .
ISSN
1063-7737 .
S2CID
119257644 .
^
a
b Stassun, Keivan G.; et al. (9 September 2019).
"The Revised TESS Input Catalog and Candidate Target List" . The Astronomical Journal . 158 (4): 138.
arXiv :
1905.10694 .
Bibcode :
2019AJ....158..138S .
doi :
10.3847/1538-3881/ab3467 .
eISSN
1538-3881 .
hdl :
1721.1/124721 .
S2CID
166227927 .
^
a
b Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (April 8, 2004).
"The angular sizes of dwarf stars and subgiants: Surface brightness relations calibrated by interferometry" . Astronomy & Astrophysics . 426 (1): 297–307.
arXiv :
astro-ph/0404180 .
Bibcode :
2004A&A...426..297K .
doi :
10.1051/0004-6361:20035930 .
eISSN
1432-0746 .
ISSN
0004-6361 .
S2CID
6077801 .
^
a
b
c Shorlin, S. L. S.; Wade, G. A.; Donati, J.-F.; Landstreet, J. D.; Petit, P.; Sigut, T. A. A.; Strasser, S. (2002).
"A highly sensitive search for magnetic fields in B, A and F stars" . Astronomy & Astrophysics . 392 (2): 637–652.
Bibcode :
2002A&A...392..637S .
doi :
10.1051/0004-6361:20021192 .
ISSN
0004-6361 .
S2CID
1706867 .
^
a
b McDonald, I.; Zijlstra, A. A.; Watson, R. A. (15 June 2017).
"Fundamental parameters and infrared excesses of Tycho–Gaia stars" . Monthly Notices of the Royal Astronomical Society . 471 (1): 770–791.
arXiv :
1706.02208 .
Bibcode :
2017MNRAS.471..770M .
doi :
10.1093/mnras/stx1433 .
eISSN
1365-2966 .
ISSN
0035-8711 .
S2CID
73594365 .
^
a
b 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 .
eISSN
1432-0746 .
ISSN
0004-6361 .
^
a
b 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 .
eISSN
1562-6873 .
ISSN
1063-7737 .
S2CID
118345778 .
^
"HD 195479" .
SIMBAD .
Centre de données astronomiques de Strasbourg . Retrieved March 13, 2024 .
^ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017).
"Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars" . Monthly Notices of the Royal Astronomical Society . 472 (4): 3805–3820.
arXiv :
1709.01160 .
Bibcode :
2017MNRAS.472.3805G .
doi :
10.1093/mnras/stx2219 .
eISSN
1365-2966 .
ISSN
0035-8711 .
S2CID
118879856 .
^ 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.
Bibcode :
2001AJ....122.3466M .
doi :
10.1086/323920 .
ISSN
0004-6256 .
S2CID
119533755 .
^ Burnham, S. W. (November 1875). "Sixth Catalogue of 90 new double stars discovered with a 6‐inch refractor". Astronomische Nachrichten . 86 (22). Wiley: 337–350.
Bibcode :
1875AN.....86..337B .
doi :
10.1002/asna.18750862202 .
ISSN
0004-6337 .
S2CID
121918815 .
^ Vallenari, A.; et al. (Gaia collaboration) (2023).
"Gaia Data Release 3. Summary of the content and survey properties" . Astronomy and Astrophysics . 674 : A1.
arXiv :
2208.00211 .
Bibcode :
2023A&A...674A...1G .
doi :
10.1051/0004-6361/202243940 .
S2CID
244398875 .
Gaia DR3 record for this source at
VizieR .
^ Vallenari, A.; et al. (Gaia collaboration) (2023).
"Gaia Data Release 3. Summary of the content and survey properties" . Astronomy and Astrophysics . 674 : A1.
arXiv :
2208.00211 .
Bibcode :
2023A&A...674A...1G .
doi :
10.1051/0004-6361/202243940 .
S2CID
244398875 .
Gaia DR3 record for this source at
VizieR .