| 释义 |
- Spectrum
- Variability
- References
{{Starbox begin
| name= GR Andromedae
}}{{Starbox observe
| epoch=J2000
| ra={{RA|00|28|28.5694}}[1]
| dec={{DEC|+32|26|15.8791}}[1]
| appmag_v= 6.87 – 6.95 variable
| constell=Andromeda
}}{{Starbox character
| class=A2pSrCrEu
| appmag_1_passband = B
| appmag_1 = 6.99[2]
| appmag_2_passband = V
| appmag_2 = 6.91[2]
| appmag_3_passband = G
| appmag_3 = 6.8449[1]
| appmag_4_passband = J
| appmag_4 = 6.708
| appmag_5_passband = H
| appmag_5 = 6.765
| appmag_6_passband = K
| appmag_6 = 6.739
| r-i =
| v-r =
| b-v =
| u-b =
| j-h =
| j-k =
| variable = α2 CVn
}}{{Starbox astrometry
| radial_v= {{val|-18.2|0.7}}[12]
| prop_mo_ra={{val|-28.861|0.093}} [1]
| prop_mo_dec={{val|-20.308|0.070}}[1]
| parallax= 5.3516
| p_error= 0.0704
| parallax_footnote = [1]
| dist_ly =
| dist_pc =
| absmag_v = +0.88[16]
| absmag_bol =
}}{{Starbox detail
| source =
| mass = 2.24[16]
| mass_mj =
| radius = 2.24[18]
| radius_rj =
| radius_km =
| luminosity = 37[16]
| luminosity_bolometric =
| luminosity_visual =
| habitable_inner =
| habitable_outer =
| gravity = 3[20]
| temperature = 8,542[20]
| metal =
| metal_fe = 1[20]
| rotation = 518.2 days[23]
| rotational_velocity = < 6[18]
| age =
| age_myr = 525[16]
| age_gyr =
}}{{Starbox catalog
| names=2MASS J00282858+3226159, BD+31 59, HD 2453, HIP 2243, SAO 53921, TYC 2266-725-1
}}{{Starbox reference |
}}{{Starbox end}}GR Andromedae (often abbreviated to GR And) is a variable star in the constellation Andromeda. Its apparent visual magnitude varies between 6.87 and 6.95 in a cycle of 518.2 days.[23] It is classified as an α2 Canum Venaticorum variable.SpectrumThe radiation emitted by GP Andromedae is a typical stellar blackbody with absorption lines from various elements, which gives to the star a spectral type A2pSrCrEu, meaning that unusually strong lines of strontium, chromium and europium can be observed.[ GP Andromedae is thus classified as an Ap star. The intensity and profile of the spectral lines varies within a cycle with the same period as the brightness variations.[18]] VariabilityPhotometric and spectral variability of GR Andromedae is typical of a star with a strong and variable magnetic field. This way, the 518.2 days periodicity can be identified as the rotation period of the star.[18] It's among the slowest rotators in the category of magnetic chemically peculiar stars, with a calculated equatorial rotation rate of only {{val|0.2|ul=km/s}}.[23]References1. ^1 2 3 4 5 {{cite DR2|2862719780094988928}}
2. ^1 {{cite simbad | title=GR And | access-date=November 8, 2018}}
3. ^1 2 3 {{citation | last1=Soubiran | first1=Caroline | last2=Le Campion | first2=Jean-François | last3=Brouillet | first3=Nathalie | last4=Chemin | first4=Laurent | title=The PASTEL catalogue: 2016 version | journal=Astronomy & Astrophysics | display-authors=1 | volume=591 | pages=A118 | year=2016 | bibcode=2016A&A...591A.118S | doi=10.1051/0004-6361/201628497 | arxiv=1605.07384 | postscript=. }}
4. ^1 {{Cite journal| doi = 10.1134/S1063773706110065| bibcode=2006AstL...32..759G| title = Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system| journal = Astronomy Letters| volume = 32| issue = 11| pages = 759–771| date = November 2006| last1 = Gontcharov | first1 = G. A.|arxiv = 1606.08053 }}
5. ^1 2 3 4 {{cite journal | title=Photoelectric photometry of chemically peculiar stars at the Catania astrophysical observatory. Observatory of HD 2453, HD 71866, HD 72968 and HD 126515. | last1=Catalano | first1=F. A. | last2=Leone | first2=F. | journal=Astronomy and Astrophysics Supplement Series | volume=83 | pages=491 | date=June 1990 | bibcode=1990A&AS...83..491C}}
6. ^1 2 3 {{cite journal | title=On the Photometric Variability of Very Sharp-lined Cool mCP Stars | last1=Pyper | first1=D. M. | last2=Adelman | first2=S. J. | journal=Publications of the Astronomical Society of the Pacific | volume=129 | issue=980 | pages=104203 | date=October 2017 | bibcode=2017PASP..129j4203P | doi=10.1088/1538-3873/aa7c9e}}
7. ^1 2 3 4 {{cite journal|bibcode=2006A&A...450..763K|title=Evolutionary state of magnetic chemically peculiar stars|journal=Astronomy and Astrophysics|volume=450|issue=2|pages=763|last1=Kochukhov|first1=O.|last2=Bagnulo|first2=S.|year=2006|doi=10.1051/0004-6361:20054596}}
}}{{Stars of Andromeda}} 8 : Andromeda (constellation)|Objects with variable star designations|2MASS objects|Hipparcos objects|Henry Draper Catalogue objects|Alpha2 Canum Venaticorum variables|Ap star|A-type main-sequence stars |