QV Andromedae
{{Short description|Star in the constellation Andromeda}}
{{Starbox begin
| name= QV Andromedae
}}
{{Starbox image
| image = 250px
| caption = A light curve for QV Andromedae, plotted from TESS data,
with the 5.23 day rotation period shown in red
}}
{{Starbox observe
| epoch=J2000
| ra={{RA|01|16|24.4904}}{{cite DR2|401569963186136960}}
| constell=Andromeda
}}
{{Starbox character
| appmag_1_passband = U
| appmag_1 = 6.23{{cite simbad | title=QV And | access-date=October 17, 2018 }}
| appmag_2_passband = B
| appmag_3_passband = V
| appmag_4_passband = G
| appmag_5_passband = J
| appmag_6_passband = H
| appmag_7_passband = K
| r-i =
| v-r =
| j-h =
| j-k =
| variable = ACV
}}
{{Starbox astrometry
| prop_mo_ra={{val|9.696|0.121}}
| prop_mo_dec={{val|2.699|0.166}}
| parallax= 4.4041
| p_error= 0.0914
| absmag_v =
| absmag_bol =
}}
{{Starbox detail
| radius =
| radius_rj =
| radius_km =
| luminosity_bolometric =
| luminosity_visual =
| habitable_inner =
| habitable_outer =
| gravity = {{val|3.541|0.039}}
| temperature = {{val|12,384|150}}
| metal =
| metal_fe =
| rotation =
| rotational_velocity = {{val|49|15}}
| age =
| age_myr =
| age_gyr =
}}
{{Starbox catalog
| names=2MASS J01162450+4804561, BD+47 357, FK5 2085, HD 7546, HIP 5939, HR 369, SAO 37067, TYC 3268-835-1
}}
{{Starbox reference
| Simbad=QV+And
}}
{{Starbox end}}
QV Andromedae (abbreviated to QV And, also known as HR 369 in the Bright Star Catalogue) is an Alpha2 Canum Venaticorum variable in the constellation Andromeda. Its maximum apparent visual magnitude is 6.6, so it can be seen by the naked eye under very favourable conditions. The brightness varies slightly following a periodic cycle of approximately 5.23 days.
The stellar classification of this star is B9IIIpSi, where the pSi suffix indicates that the star shows peculiar chemical composition with stronger than usual silicon lines. This type of star is known as an Ap star, with the chemical peculiarities caused by strong magnetic fields and slow rotation leading to chemical stratification in the atmosphere. The star is rotating at a projected rotational velocity of 49 km/s, with up to 0.05 magnitude variation of brightness during one rotation cycle. This leads to the classification of the star as an Alpha2 Canum Venaticorum variable.
The variability of QV Andromedae was first identified in 1975, and confirmed from Hipparcos photometry. It was assigned the variable star designation QV Andromedae in the 73rd namelist of variable stars in 1997.
References
{{Reflist |refs=
[http://webviz.u-strasbg.fr/viz-bin/VizieR-S?V*%20QV%20And QV And], database entry, Combined General Catalog of Variable Stars (GCVS4.2, 2004 Ed.), N. N. Samus, O. V. Durlevich, et al., CDS ID [http://cdsarc.u-strasbg.fr/viz-bin/Cat?II/250 II/250] Accessed on line 2018-10-17.
| title=MAST: Barbara A. Mikulski Archive for Space Telescopes
| url=https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html
| publisher=Space Telescope Science Institute | access-date=26 August 2024}}
| last1=Høg | first1=E. | last2=Fabricius | first2=C.
| last3=Makarov | first3=V. V. | last4=Urban | first4=S.
| last5=Corbin | first5=T. | last6=Wycoff | first6=G.
| last7=Bastian | first7=U. | last8=Schwekendiek | first8=P.
| last9=Wicenec | first9=A.
| title=The Tycho-2 catalogue of the 2.5 million brightest stars
| journal=Astronomy & Astrophysics
| volume=355 | pages=L27–L30 | year=2000
| bibcode=2000A&A...355L..27H | postscript=. }}
| last1=de Bruijne | first1=J. H. J. | last2=Eilers | first2=A.-C.
| title=Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project
| journal=Astronomy & Astrophysics
| volume=546 | id=A61 | pages=14 | date=October 2012
| doi=10.1051/0004-6361/201219219 | bibcode=2012A&A...546A..61D
| arxiv=1208.3048 | s2cid=59451347 | postscript=. }}
}}
{{Stars of Andromeda}}
{{DEFAULTSORT:QV Andromedae}}
Category:Andromeda (constellation)
Category:Alpha2 Canum Venaticorum variables