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Suspected variable star in Triangulum.
HD 11928 (HR 564; NSV 15408 ) is a solitary star
[13] located in the northern constellation of
Triangulum . It is faintly visible to the naked eye as a red-hued point of light with an
apparent magnitude of 5.85.
[14]
Gaia DR3
parallax measurements imply a distance of 530
light-years and it is drifting closer with a heliocentric
radial velocity of −1.93
km/s .
[6] At its current distance, HD 11928's brightness is diminished by an
interstellar extinction of 0.13
magnitudes
[15] and it has an
absolute magnitude of +0.11.
[7]
HD 11928 has a
stellar classification of M2 III,
[4] indicating that is an
evolved
M-type
giant star . It is currently an
asymptotic giant branch star that is generating energy via the fusion of
hydrogen and
helium shells around an inert
carbon
core . At present it has expanded to 52.68 times the
radius of the Sun
[8] and it radiates 485 times the
luminosity of the Sun
[9] from its
photosphere at an
effective temperature of 3,656
K .
[11]
In 1997, the
Hipparcos satellite observed that the star varied from 5.89 to 5.93 in the
Hipparcos passband .
[16] Further observations from Koen & Eyer reveal that HD 11928 flucates between 5.84 and 5.85 in the visual passband within 50.7
days .
[17] As of 2004 however, its variability has not been confirmed,
[18] but it is still suspected to be variable.
References
^
a
b
c
d 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 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
125853869 .
^ 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 .
S2CID
121672252 .
^
a
b Wilson, Ralph E.; Joy, Alfred H. (March 1950).
"Radial Velocities of 2111 Stars" . The Astrophysical Journal . 111 : 221.
Bibcode :
1950ApJ...111..221W .
doi :
10.1086/145261 .
eISSN
1538-4357 .
ISSN
0004-637X .
S2CID
122883647 .
^ Haggkvist, L.; Oja, T. (1970). "Results of BV photometry 1969-70 (Uppsala refractor)". Private Communication .
Bibcode :
1970Priv.........0H .
S2CID
231475662 .
^
a
b Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (January 2005).
"Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters" . Astronomy and Astrophysics . 430 : 165.
arXiv :
astro-ph/0409579 .
Bibcode :
2005A&A...430..165F .
doi :
10.1051/0004-6361:20041272 .
S2CID
17804304 .
^
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
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. (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 van Belle, G. T.; Lane, B. F.; Thompson, R. R.; Boden, A. F.; Colavita, M. M.; Dumont, P. J.; Mobley, D. W.; Palmer, D.; Shao, M.; Vasisht, G. X.; Wallace, J. K.; Creech-Eakman, M. J.; Koresko, C. D.; Kulkarni, S. R.; Pan, X. P.; Gubler, J. (1999).
"Radii and Effective Temperatures for G, K, and M Giants and Supergiants" . The Astronomical Journal . 117 (1): 521–533.
Bibcode :
1999AJ....117..521V .
doi :
10.1086/300677 .
S2CID
18617983 .
^
"HD 11928" .
SIMBAD .
Centre de données astronomiques de Strasbourg . Retrieved May 11, 2024 .
^ Eggleton, P. P.; Tokovinin, A. A. (11 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 .
eISSN
1365-2966 .
ISSN
0035-8711 .
S2CID
14878976 .
^ 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 .
S2CID
17128864 .
^ 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 .
^ Perryman, M. A. C.; Lindegren, L.; Kovalevsky, J.; Hoeg, E.; Bastian, U.; Bernacca, P. L.; Crézé, M.; Donati, F.; Grenon, M.; Grewing, M.; van Leeuwen, F. (July 1997). "The HIPPARCOS Catalogue". Astronomy and Astrophysics . 323 : L49–L52.
Bibcode :
1997A&A...323L..49P .
ISSN
0004-6361 .
^ Koen, Chris; Eyer, Laurent (March 2002).
"New periodic variables from the Hipparcos epoch photometry" . Monthly Notices of the Royal Astronomical Society . 331 (1): 45–59.
arXiv :
astro-ph/0112194 .
Bibcode :
2002MNRAS.331...45K .
doi :
10.1046/j.1365-8711.2002.05150.x .
eISSN
1365-2966 .
ISSN
0035-8711 .
S2CID
10505995 .
^ Samus, N. N.; Durlevich, O. V. (November 2004). "VizieR Online Data Catalog: Combined General Catalogue of Variable Stars (Samus+ 2004)". VizieR Online Data Catalog : II/250.
Bibcode :
2004yCat.2250....0S .