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M-type star in the constellation Delphinus
HD 200044 (HR 8044 ) is a solitary
[13]
star in the equatorial
constellation
Delphinus . It has an
apparent magnitude of 5.7,
[2] allowing it to be faintly seen with the
naked eye . The object is located 598
light years away,
[1] but is approaching the
Solar System with a heliocentric
radial velocity of −15.07
km/s .
[7]
HD 200044 has a
spectral classification of M3 IIIab,
[4] indicating that its an ageing
red giant . It is currently on the
asymptotic giant branch and is fusing hydrogen and helium in shells around an inert carbon core.
[3] As a consequence, it has expanded to 58 times the
radius of the Sun and is now radiating with a
luminosity over 500 times greater than that of the
Sun . HD 200044's large size and high luminosity yield an
effective temperature of 3,707
K , giving it a red glow. HD 200044 is suspected to be a variable star with an amplitude of 0.05 magnitudes.
[6]
There is a 10th magnitude
optical companion separated 49.3
″ away and at a position angle of 337
° as of 2014. However, the separation is increasing due to HD 200044's high proper motion.
[14]
References
^
a
b
c
d
e
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 .
^
a
b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics . 355 : L27–L30.
Bibcode :
2000A&A...355L..27H .
ISSN
0004-6361 .
^
a
b Eggen, Olin J. (July 1992).
"Asymptotic giant branch stars near the sun" . The Astronomical Journal . 104 : 275.
Bibcode :
1992AJ....104..275E .
doi :
10.1086/116239 .
ISSN
0004-6256 .
^
a
b Yamashita, Y. (1967). "MK Spectral Types of Bright M-Type Stars". Publications of the Dominion Astrophysical Observatory Victoria . 13 : 44.
Bibcode :
1967PDAO...13...47Y .
ISSN
0078-6950 .
^ Haggkvist, L.; Oja, T. (1970). "Results of BV photometry 1969-70 (Uppsala refractor)". Private Communication .
Bibcode :
1970Priv.........0H .
^
a
b Samus’, N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (January 2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports . 61 (1): 80–88.
Bibcode :
2017ARep...61...80S .
doi :
10.1134/S1063772917010085 .
eISSN
1562-6881 .
ISSN
1063-7729 .
S2CID
255195566 .
^
a
b Famaey, B.; Pourbaix, D.; Frankowski, A.; Van Eck, S.; Mayor, M.; Udry, S.; Jorissen, A. (18 February 2009).
"Spectroscopic binaries among Hipparcos M giants" . Astronomy & Astrophysics . 498 (2): 627–640.
arXiv :
0901.0934 .
Bibcode :
2009A&A...498..627F .
doi :
10.1051/0004-6361/200810698 .
eISSN
1432-0746 .
ISSN
0004-6361 .
^ 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 .
^ Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3. Proper-motion anomaly and resolved common proper-motion pairs". Astronomy and Astrophysics . 657 : 657.
arXiv :
2109.10912 .
Bibcode :
2022A&A...657A...7K .
doi :
10.1051/0004-6361/202142146 .
S2CID
237605138 .
^
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 .
ISSN
0004-6256 .
^
Brown, A. G. A. ; et al. (Gaia collaboration) (August 2018).
"Gaia Data Release 2: Summary of the contents and survey properties" .
Astronomy & Astrophysics . 616 . A1.
arXiv :
1804.09365 .
Bibcode :
2018A&A...616A...1G .
doi :
10.1051/0004-6361/201833051 .
Gaia DR2 record for this source at
VizieR .
^ McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017).
"Fundamental parameters and infrared excesses of Tycho-Gaia stars" . Monthly Notices of the Royal Astronomical Society . 471 (1): 770.
arXiv :
1706.02208 .
Bibcode :
2017MNRAS.471..770M .
doi :
10.1093/mnras/stx1433 .
^ 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.
arXiv :
0806.2878 .
Bibcode :
2008MNRAS.389..869E .
doi :
10.1111/j.1365-2966.2008.13596.x .
S2CID
14878976 .
^ 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 .