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{{Short description|Variable star in the constellation Andromeda}}
{{Starbox begin
{{Starbox begin
| name= GR Andromedae
| name= GR Andromedae
}}
{{Starbox image
| image = [[Image:GRAndLightCurve.png|250px]]
| caption = The [[Photometric_system#Photometric_letters|visual band]] [[light curve]] of GR Andromedae, showing variation about the mean brightness. Adapted from Pyper ''et al.'' (2017)<ref name=Pyper2017/>
}}
}}
{{Starbox observe
{{Starbox observe
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<ref name=GCVS>[http://webviz.u-strasbg.fr/viz-bin/VizieR-S?V*%20GR%20And GR And], database entry, Combined General Catalog of Variable Stars (GCVS4.2, 2004 Ed.), N. N. Samus, O. V. Durlevich, et al., [[Centre de Données astronomiques de Strasbourg|CDS]] ID [http://cdsarc.u-strasbg.fr/viz-bin/Cat?II/250 II/250] Accessed on line 2018-10-17.</ref>
<ref name=GCVS>[http://webviz.u-strasbg.fr/viz-bin/VizieR-S?V*%20GR%20And GR And], database entry, Combined General Catalog of Variable Stars (GCVS4.2, 2004 Ed.), N. N. Samus, O. V. Durlevich, et al., [[Centre de Données astronomiques de Strasbourg|CDS]] ID [http://cdsarc.u-strasbg.fr/viz-bin/Cat?II/250 II/250] Accessed on line 2018-10-17.</ref>


<ref name="2MASS Cat">{{cite journal |title=VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) |journal=CDS/ADC Collection of Electronic Catalogues |pages=II/246 |last1=Cutri |first1=R. M. |last2=Skrutskie |first2=M. F. |last3=Van Dyk |first3=S. |last4=Beichman |first4=C. A. |last5=Carpenter |first5=J. M. |last6=Chester |first6=T. |last7=Cambresy |first7=L. |last8=Evans |first8=T. |last9=Fowler |first9=J. |last10=Gizis |first10=J. |last11=Howard |first11=E. |last12=Huchra |first12=J. |last13=Jarrett |first13=T. |last14=Kopan |first14=E. L. |last15=Kirkpatrick |first15=J. D. |last16=Light |first16=R. M. |last17=Marsh |first17=K. A. |last18=McCallon |first18=H. |last19=Schneider |first19=S. |last20=Stiening |first20=R. |last21=Sykes |first21=M. |last22=Weinberg |first22=M. |last23=Wheaton |first23=W. A. |last24=Wheelock |first24=S. |last25=Zacarias |first25=N. |display-authors=3 |number=2246 |date=June 2003 |bibcode=2003yCat.2246....0C}}</ref>
<ref name="2MASS Cat">{{cite journal |bibcode=2003yCat.2246....0C |title=VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) |journal=CDS/ADC Collection of Electronic Catalogues |pages=II/246 |volume=2246 |last1=Cutri |first1=Roc M. |last2=Skrutskie |first2=Michael F. |last3=Van Dyk |first3=Schuyler D. |last4=Beichman |first4=Charles A. |last5=Carpenter |first5=John M. |last6=Chester |first6=Thomas |last7=Cambresy |first7=Laurent |last8=Evans |first8=Tracey E. |last9=Fowler |first9=John W. |last10=Gizis |first10=John E. |last11=Howard |first11=Elizabeth V. |last12=Huchra |first12=John P. |last13=Jarrett |first13=Thomas H. |last14=Kopan |first14=Eugene L. |last15=Kirkpatrick |first15=J. Davy |last16=Light |first16=Robert M. |last17=Marsh |first17=Kenneth A. |last18=McCallon |first18=Howard L. |last19=Schneider |first19=Stephen E. |last20=Stiening |first20=Rae |last21=Sykes |first21=Matthew J. |last22=Weinberg |first22=Martin D. |last23=Wheaton |first23=William A. |last24=Wheelock |first24=Sherry L. |last25=Zacarias |first25=N. |year=2003 |url=http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=II/246 }}</ref>


<ref name=PASTEL>{{citation
<ref name=PASTEL>{{citation
Line 95: Line 100:
| volume=591 | pages=A118 | year=2016
| volume=591 | pages=A118 | year=2016
| bibcode=2016A&A...591A.118S | doi=10.1051/0004-6361/201628497
| bibcode=2016A&A...591A.118S | doi=10.1051/0004-6361/201628497
| arxiv=1605.07384 | postscript=. }}</ref>
| arxiv=1605.07384 | s2cid=119258214 | postscript=. }}</ref>


<ref name=rv>{{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 }}</ref>
<ref name=rv>{{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 | s2cid=119231169}}</ref>


<ref name=Catalano1990>{{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}}</ref>
<ref name=Catalano1990>{{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}}</ref>


<ref name=Pyper2017>{{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}}</ref>
<ref name=Pyper2017>{{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| doi-access=free }}</ref>


<ref name=kochukhov>{{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|arxiv=astro-ph/0601461}}</ref>
<ref name=kochukhov>{{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|arxiv=astro-ph/0601461|s2cid=18596834}}</ref>


}}
}}
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{{Stars of Andromeda}}
{{Stars of Andromeda}}


{{DEFAULTSORT:GR Andromedae}}
[[Category:Andromeda (constellation)]]
[[Category:Andromeda (constellation)]]
[[Category:Objects with variable star designations|Andromedae, GR]]
[[Category:Objects with variable star designations|Andromedae, GR]]
[[Category:2MASS objects]]
[[Category:2MASS objects|J00282858+3226159]]
[[Category:Durchmusterung objects|BD+31 59]]
[[Category:Hipparcos objects|002243]]
[[Category:Hipparcos objects|002243]]
[[Category:Henry Draper Catalogue objects|002453]]
[[Category:Henry Draper Catalogue objects|002453]]

Latest revision as of 07:38, 27 October 2022

GR Andromedae

The visual band light curve of GR Andromedae, showing variation about the mean brightness. Adapted from Pyper et al. (2017)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 00h 28m 28.5694s[2]
Declination +32° 26′ 15.8791″[2]
Apparent magnitude (V) 6.87 – 6.95 variable[3]
Characteristics
Spectral type A2pSrCrEu[3]
Apparent magnitude (B) 6.99[4]
Apparent magnitude (V) 6.91[4]
Apparent magnitude (G) 6.8449[2]
Apparent magnitude (J) 6.708[5]
Apparent magnitude (H) 6.765[5]
Apparent magnitude (K) 6.739[5]
Variable type α2 CVn[3]
Astrometry
Radial velocity (Rv)−18.2±0.7[6] km/s
Proper motion (μ) RA: −28.861±0.093 [2] mas/yr
Dec.: −20.308±0.070[2] mas/yr
Parallax (π)5.3516 ± 0.0704 mas[2]
Distance609 ± 8 ly
(187 ± 2 pc)
Absolute magnitude (MV)+0.88[7]
Details
Mass2.24[7] M☉
Radius2.24[8] R☉
Luminosity37[7] L☉
Surface gravity (log g)3[9] cgs
Temperature8,542[9] K
Metallicity [Fe/H]1[9] dex
Rotation518.2 days[1]
Rotational velocity (v sin i)< 6[8] km/s
Age525[7] Myr
Other designations
2MASS J00282858+3226159, BD+31 59, HD 2453, HIP 2243, SAO 53921, TYC 2266-725-1
Database references
SIMBADdata

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.[1] It is classified as an α2 Canum Venaticorum variable.[3]

Spectrum

[edit]

The 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.[3] 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.[8]

Variability

[edit]

Photometric 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.[8] It's among the slowest rotators in the category of magnetic chemically peculiar stars, with a calculated equatorial rotation rate of only 0.2 km/s.[1]

References

[edit]
  1. ^ a b c d Pyper, D. M.; Adelman, S. J. (October 2017). "On the Photometric Variability of Very Sharp-lined Cool mCP Stars". Publications of the Astronomical Society of the Pacific. 129 (980): 104203. Bibcode:2017PASP..129j4203P. doi:10.1088/1538-3873/aa7c9e.
  2. ^ a b c d e f 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.
  3. ^ a b c d e GR And, database entry, Combined General Catalog of Variable Stars (GCVS4.2, 2004 Ed.), N. N. Samus, O. V. Durlevich, et al., CDS ID II/250 Accessed on line 2018-10-17.
  4. ^ a b "GR And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved November 8, 2018.
  5. ^ a b c Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E.; Fowler, John W.; Gizis, John E.; Howard, Elizabeth V.; Huchra, John P.; Jarrett, Thomas H.; Kopan, Eugene L.; Kirkpatrick, J. Davy; Light, Robert M.; Marsh, Kenneth A.; McCallon, Howard L.; Schneider, Stephen E.; Stiening, Rae; Sykes, Matthew J.; Weinberg, Martin D.; Wheaton, William A.; Wheelock, Sherry L.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues. 2246: II/246. Bibcode:2003yCat.2246....0C.
  6. ^ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
  7. ^ a b c d Kochukhov, O.; Bagnulo, S. (2006). "Evolutionary state of magnetic chemically peculiar stars". Astronomy and Astrophysics. 450 (2): 763. arXiv:astro-ph/0601461. Bibcode:2006A&A...450..763K. doi:10.1051/0004-6361:20054596. S2CID 18596834.
  8. ^ a b c d Catalano, F. A.; Leone, F. (June 1990). "Photoelectric photometry of chemically peculiar stars at the Catania astrophysical observatory. Observatory of HD 2453, HD 71866, HD 72968 and HD 126515". Astronomy and Astrophysics Supplement Series. 83: 491. Bibcode:1990A&AS...83..491C.
  9. ^ a b c Soubiran, Caroline; et al. (2016), "The PASTEL catalogue: 2016 version", Astronomy & Astrophysics, 591: A118, arXiv:1605.07384, Bibcode:2016A&A...591A.118S, doi:10.1051/0004-6361/201628497, S2CID 119258214.
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