HD 200044

Short description: M-type star in the constellation Delphinus

HD 200044  Observation data
Epoch J2000.0 Equinox (celestial coordinates)

Constellation | Delphinus[1]
Right ascension |  21h 00m 27.6883s[2]
Declination | +19° 19′ 46.493″[2]
Apparent magnitude (V) | 5.70±0.01[3]
Characteristics
Evolutionary stage | AGB[4]
Spectral type | M3 IIIab[5]
B−V color index | +1.61[6]
Variable type | suspected[7]
Astrometry
Radial velocity (Rv)| −15.07±0.09[8] km/s
Proper motion (μ)|  RA: −15.483[2] mas/yr
Dec.: −59.705[2] mas/yr
Parallax (π)| 5.455 ± 0.0753[2] mas
Distance| 598 ± 8 ly
(183 ± 3 pc)
Absolute magnitude (MV)| −0.33[1]
Details
Mass| 1.32[9] M☉
Radius| 58[10] R☉
Luminosity| 507[11] L☉
Surface gravity (log g)| 1.11[12] cgs
Temperature| 3,707[10] K
Age| 13.5[12] Gyr
Other designations

BD+18°4675, GC 29329, HD 200044, HIP 103675, HR 8044, SAO 106747, WDS J21005+1920A

Database references
SIMBAD| data

HD 200044 (HR 8044) is a solitary[13] star in the equatorial constellation Delphinus. It has an apparent magnitude of 5.7,[3] allowing it to be faintly seen with the naked eye. The object is located 598 light years away,[2] but is approaching the Solar System with a heliocentric radial velocity of −15.07 km/s.[8]

HD 200044 has a spectral classification of M3 IIIab,[5] 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.[4] 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.[7]

There is a 10th magnitude optical companion separated 49.3″ away and at a position angle of 337° as of 2014. It has a much smaller parallax (ie. greater distance) than HD 20044[14] and the separation of the two stars is increasing due to HD 200044's high proper motion.[15]

## References

1. ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A XHIP record for this object at VizieR.
2. ↑ 2.0 2.1 2.2 2.3 2.4 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.
3. ↑ 3.0 3.1 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H.
4. ↑ 4.0 4.1 Eggen, Olin J. (July 1992). "Asymptotic giant branch stars near the sun". The Astronomical Journal 104: 275. doi:10.1086/116239. ISSN 0004-6256. Bibcode: 1992AJ....104..275E.
5. ↑ 5.0 5.1 Yamashita, Y. (1967). "MK Spectral Types of Bright M-Type Stars". Publications of the Dominion Astrophysical Observatory Victoria 13: 44. ISSN 0078-6950. Bibcode: 1967PDAO...13...47Y.
6. ↑ Haggkvist, L.; Oja, T. (1970). "Results of BV photometry 1969-70 (Uppsala refractor)". Private Communication. Bibcode: 1970Priv.........0H.
7. ↑ 7.0 7.1 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. doi:10.1134/S1063772917010085. ISSN 1063-7729. Bibcode: 2017ARep...61...80S.
8. ↑ 8.0 8.1 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. doi:10.1051/0004-6361/200810698. ISSN 0004-6361. Bibcode: 2009A&A...498..627F.
9. ↑ 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. doi:10.1051/0004-6361/202142146. Bibcode: 2022A&A...657A...7K.
10. ↑ 10.0 10.1 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.
11. ↑ Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
12. ↑ 12.0 12.1 Kordopatis, G.; Schultheis, M.; McMillan, P. J.; Palicio, P. A.; De Laverny, P.; Recio-Blanco, A.; Creevey, O.; Álvarez, M. A. et al. (2023). "Stellar ages, masses, extinctions, and orbital parameters based on spectroscopic parameters of Gaia DR3". Astronomy and Astrophysics 669: A104. doi:10.1051/0004-6361/202244283. Bibcode: 2023A&A...669A.104K.
13. ↑ 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.
14. ↑ 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.
15. ↑ 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.

* v
* t
* e

Delphinus constellation

Stars
(list)|

| Bayer|

* α (Sualocin)
* β (Rotanev)
* γ1
* γ2
* δ
* ε (Aldulfin)
* ζ
* η
* θ
* ι
* κ
* ρ Aql (Tso Ke)

|

Flamsteed|

* 1
* 10
* 13
* 14
* 15
* 16
* 17
* 18 (Musica)

Variable|

* U
* V
* W
* TX
* TY
* BX
* CM
* DM
* DX
* EU
* HR
* HU
* LS
* LT
* LU
* MR
* V339

HR|

* 7771
* 7774
* 7778
* 7793
* 7810
* 7813
* 7816
* 7820
* 7824
* 7839
* 7899
* 7907
* 7914
* 7954
* 7975
* 8010
* 8044
* 8057
* 8088

HD|

* 194578
* 194841
* 195019
* 195909

Gliese|

* Gliese 795

Other|

* HAT-P-23
* WASP-2
* WISE 2056+1459

Star
clusters|

| Open|

* NGC 6950

|

Globular|

* NGC 6934
* NGC 7006

Nebulae|

| Planetary|

* NGC 6891
* NGC 6905
* Abell 72

|

Galaxies|

| NGC|

* 6917
* 6927
* 6928
* 6930
* 6944
* 6954
* 6955
* 6956
* 6957
* 6969
* 6971
* 6972
* 6988
* 7003
* 7025
* 7028

|

Other|

* 3C 411

Other|

* PKS 2032+107

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