Alpha Sagittae, formally named Sham/ˈʃæm/,[11][12] is a single[13] star in the northern constellation of Sagitta. Alpha Sagittae is the Bayer designation, which is latinized from α Sagittae and abbreviated Alpha Sge or α Sge. It is visible to the naked eye as a yellow-hued star with an apparent visual magnitude of +4.38.[2] Despite the name, this is not the brightest star in the constellation – that distinction belongs to Gamma Sagittae. Based upon parallax measurements, Alpha Sagittae is approximately 382 light-years from the Sun. It is moving further away from the Earth with a heliocentric radial velocity of 1.7 km/s.[5]
This is an evolved bright giant with a stellar classification of G1 II.[3] It is 151[7] million years old with 4[7] times the mass of the Sun and has expanded to around 21[8] times the Sun's radius. It is radiating 340 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 5,333 K.[3] There is an X-ray source within 12″ of these coordinates.[14]
The evolutionary state of Alpha Sagittae is unclear. Its temperature and luminosity place it within the Hertzsprung gap, a region of the H-R diagram where stars more massive than the sun are evolving rapidly away from the main sequence towards becoming red giants. However, the chemical composition of its surface indicates that it has already experienced the first dredge-up of fusion products that occurs soon after a star reaches the red giant branch. It also lies within the Cepheid instability strip, but is not a Cepheid variable.[15] It belongs to a small group of known stars that have been called carbon-deficient red giants and may have experienced binary mass exchanges.[16]
^ abcdeBrown, 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.
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^"5 Sge". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-03-30.
^Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7.
^Cite error: The named reference IAU-LSN was invoked but never defined (see the help page).
^Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
^Cite error: The named reference Greiner2015 was invoked but never defined (see the help page).
^Vanture, Andrew D.; Wallerstein, George (1999). "Carbon, Nitrogen, and Oxygen Abundances of Selected Stars in the Hertzsprung Gap". Publications of the Astronomical Society of the Pacific. 111 (755): 84. Bibcode:1999PASP..111...84V. doi:10.1086/316306.
^Bond, Howard E. (2019). "Carbon-deficient Red Giants". The Astrophysical Journal. 887 (1): 12. arXiv:1910.06256. Bibcode:2019ApJ...887...12B. doi:10.3847/1538-4357/ab4e13. S2CID 204512549.
his Uranometria, Bayer depicted Alpha, Beta, and Epsilon Sagittae as the fins of the arrow. Also known as Sham, Alpha is a yellow bright giant star of...
the beginning of spring Sham, or Alsahm, the Arabic name for the star AlphaSagittae Fraud Sham drug as a quack remedy Sham election, another name for a...
known to exist. Later observations of the object showed a bow shock in H-alpha and a smaller-in-extent shock seen in X-rays (as observed by the Chandra...
HD 183143 (HT Sagittae) is a blue hypergiant star located in the constellation of Sagitta. This star has an apparent magnitude of 6.9, meaning that can...
midst of its own planetary nebula. Stars such as Sakurai's Object and FG Sagittae are being observed as they rapidly evolve through this phase. Mapping the...
moving rapidly through space directly away from the galactic disc. The WZ Sagittae-type dwarf nova DY Canis Minoris (also known as VSX J074727.6+065050) flared...
Gamma Sagittae Star 3.47 Gamma Ceti Triple star system 3.48 Eta Leonis Multiple star system 3.48 Mu Pegasi Star 3.49 3.47 Beta Boötis Star 3.49 Alpha Telescopii...
of the Field RV Tauri Variables: EP Lyrae, DY Orionis, AR Puppis, and R Sagittae". The Astrophysical Journal. 479 (1): 427–440. Bibcode:1997ApJ...479..427G...
Gall and Inglis. p. 52 – via Internet Archive. Kaler, James B. "Menkar (Alpha Ceti)". Stars. University of Illinois. Archived from the original on 2012-05-31...
Minor. Named after Masaaki Huruhata [ja]. Huruhata's Variable is the WZ Sagittae type dwarf nova EG Cancri. Huth's "moving star" of 1801-2, discovered and...
discovered in Coma Berenices. In 1995, there was a very rare outburst of the WZ Sagittae-type dwarf nova AL Comae Berenices. A June 2003 outburst from GO Comae...
Tunisia 1923. York Beach, Maine: Samuel Weiser. ISBN 0-87728-358-3. 1980s Alpha, Hymenaeus, ed. (1983). "The Holy Books of Thelema". The Equinox. III (9)...
the subclass UGWZ – (celestial object) UG WZ Sagittae, a subclass of UG-type stars named after WZ Sagittae, the archetype for the subclass UGZ – (celestial...
1971–2007 clearly indicated a thermonuclear explosion. Other examples are HM Sagittae and RR Telescopii. Dwarf nova Nova Supernova Bryan, Greg L.; Kwok, Sun...
B-52 Bomber is set to be retired from service. Cosmic Call 1 reaches 15 Sagittae. The Teen Age Message reaches HD 76151, 37 Geminorum, HD 126053, and HD...
"Determination of the Elements of Eclipsing Variables RW Tauri and U Sagittae by an Analysis of the Light Changes in the Frequency Domain", Astrophysics...