W Mensae

	W Mensae
	Ligkurwe van W Mensae in naby-infrarooi van OGLE-data.
Sterrebeeld	Tafel
Spektraaltipe	F5Ipec
	Waarnemingsdata (Epog J2000)
Regte klimming	05h 26m 24.516s
Deklinasie	-71° 11′ 11.79″
Skynmagnitude (m)	13,90 (13,4pg - <18,3pg)
Absolute magnitude (M)	-4,8
B-V-kleurindeks	+0,45
U-B-kleurindeks	-0,24
	Besonderhede
Radius (R☉)	61
Ligsterkte (L☉)	7 700
Temperatuur (K)	6 700
Afstand (ligjaar)	~168 000
	Eienskappe
Veranderlikheid	R CrB
	Ander name
	W Mensae, HV 966, RMC 102, 2MASS J05262451-7111117, AAVSO 0527-71, OGLE LMC-RCB-13
Portaal	Sterrekunde

W Mensae (afgekort as W Men) is 'n buitengewone geelsuperreus in die Groot Magellaanse Wolk in die suidelike sterrebeeld Tafel. Dt is 'n R Coronae Borealis-veranderlike waarvan die helderheid periodiek met verskeie magnitudes afneem.

W Men is 'n baie verafgeleë ster en lê in die naburige sterrestelsel die Groot Magellaanse Wolk.^[4] Ondanks sy groot ligsterkte het dit 'n maksimum skynbare magnitude van 13,8,^[7] wat te dof is om met 'n klein teleskoop te sien. Sy radius is bereken op 61 keer die Son s'n, oftewel 61 R_☉.^[4]

W Men se veranderlikheid is in 1927 deur Willem J. Luyten ontdek.^[9] Dit behoort tot die baie skaars soort veranderlike sterre wat in die R Coronae Borealis-klas val; hulle word dikwels "omgekeerde novas" genoem omdat hulle soms baie verdof. Op sy maksimum helderheid het W Men 'n fotografiese (blou) magnitude van minder as 18,3, wat beteken dit kan dan nie op fotografiese plate bespeur word nie.^[10] Die algehele helderheid van die ster verander egter vermoedelik nie, want die afname in helderheid word waarskynlik veroorsaak deur stof wat die ster tydelik verberg. Kort golflengtes van lig word geabsorbeer en as infrarooi hervrygestel. Baie R CrB-sterre het kort pulseringstydperke; W Men het 'n tydperk van sowat 67 dae.^[7]

Verwysings wysig

↑ "The Optical Gravitational Lensing Experiment". OGLE. Besoek op 26 Januarie 2022.
↑ ^2,0 ^2,1 Milone, Luis A. (1990). "Identification charts for southern R Coronae Borealis-stars". Astrophysics and Space Science. 172 (2): 263–271. Bibcode:1990Ap&SS.172..263M. doi:10.1007/BF00643318. S2CID 118353230.
↑ ^3,0 ^3,1 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.
↑ ^4,0 ^4,1 ^4,2 ^4,3 ^4,4 ^4,5 ^4,6 Goldsmith, M. J.; Evans, A.; Albinson, J. S.; Bode, M. F. (1990). "Effective temperatures of RCB stars". Monthly Notices of the Royal Astronomical Society. 245 (1): 119–29. Bibcode:1990MNRAS.245..119G. ISSN 0035-8711.
↑ Sherwood, Vicki E. (1975). "Some Statistics of Southern R Coronae Borealis Variables (abstract)". Variable Stars and Stellar Evolution; Proceedings of the Symposium. 67: 147. Bibcode:1975IAUS...67..147S. doi:10.1007/978-94-010-9934-9_18.
↑ Pollard, K. R.; Cottrell, P. L.; Lawson, W. A. (1994). "An Abundance Analysis of R-Coronae Stars in the Galaxy and the Large Magellanic Cloud". Monthly Notices of the Royal Astronomical Society. 268 (2): 544. Bibcode:1994MNRAS.268..544P. doi:10.1093/mnras/268.2.544.
↑ ^7,0 ^7,1 ^7,2 Soszyński, I.; Udalski, A.; Szymański, M. K.; Kubiak, M.; Pietrzyński, G.; Wyrzykowski, Ł.; Szewczyk, O.; Ulaczyk, K.; Poleski, R. (2009). "The Optical Gravitational Lensing Experiment. The OGLE-III Catalog of Variable Stars. V. R Coronae Borealis Stars in the Large Magellanic Cloud". Acta Astronomica. 59 (4): 335. arXiv:0912.2097. Bibcode:2009AcA....59..335S.
↑ "W+Mensae", SIMBAD (Centre de Données astronomiques de Strasbourg), https://simbad.cds.unistra.fr/simbad/sim-id?Ident=W+Mensae, besoek op 2023-07-06
↑ Luyten, W. J. (1927). "A New Irregular Variable of the R Coronae Type". Harvard College Observatory Bulletin. 846 (846): 31–33. Bibcode:1927BHarO.846...33L. 1927BHarO.846...33L.
↑ Milone, L. A. (1975). "A Note on V CrA and W Men". Information Bulletin on Variable Stars. 989: 1. Bibcode:1975IBVS..989....1M.

Skakels wysig

Hierdie artikel is in sy geheel of gedeeltelik uit die Engelse Wikipedia vertaal.

[OGLE-1] "The Optical Gravitational Lensing Experiment". OGLE. Besoek op 26 Januarie 2022.

[milone-2] 2,0 ^2,1 Milone, Luis A. (1990). "Identification charts for southern R Coronae Borealis-stars". Astrophysics and Space Science. 172 (2): 263–271. Bibcode:1990Ap&SS.172..263M. doi:10.1007/BF00643318. S2CID 118353230.

[2mass-3] 3,0 ^3,1 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.

[Goldsmith-4] 4,0 ^4,1 ^4,2 ^4,3 ^4,4 ^4,5 ^4,6 Goldsmith, M. J.; Evans, A.; Albinson, J. S.; Bode, M. F. (1990). "Effective temperatures of RCB stars". Monthly Notices of the Royal Astronomical Society. 245 (1): 119–29. Bibcode:1990MNRAS.245..119G. ISSN 0035-8711.

[sherwood-5] Sherwood, Vicki E. (1975). "Some Statistics of Southern R Coronae Borealis Variables (abstract)". Variable Stars and Stellar Evolution; Proceedings of the Symposium. 67: 147. Bibcode:1975IAUS...67..147S. doi:10.1007/978-94-010-9934-9_18.

[pollard-6] Pollard, K. R.; Cottrell, P. L.; Lawson, W. A. (1994). "An Abundance Analysis of R-Coronae Stars in the Galaxy and the Large Magellanic Cloud". Monthly Notices of the Royal Astronomical Society. 268 (2): 544. Bibcode:1994MNRAS.268..544P. doi:10.1093/mnras/268.2.544.

[ogle-7] 7,0 ^7,1 ^7,2 Soszyński, I.; Udalski, A.; Szymański, M. K.; Kubiak, M.; Pietrzyński, G.; Wyrzykowski, Ł.; Szewczyk, O.; Ulaczyk, K.; Poleski, R. (2009). "The Optical Gravitational Lensing Experiment. The OGLE-III Catalog of Variable Stars. V. R Coronae Borealis Stars in the Large Magellanic Cloud". Acta Astronomica. 59 (4): 335. arXiv:0912.2097. Bibcode:2009AcA....59..335S.

[SIMBAD-8] "W+Mensae", SIMBAD (Centre de Données astronomiques de Strasbourg), https://simbad.cds.unistra.fr/simbad/sim-id?Ident=W+Mensae, besoek op 2023-07-06

[9] Luyten, W. J. (1927). "A New Irregular Variable of the R Coronae Type". Harvard College Observatory Bulletin. 846 (846): 31–33. Bibcode:1927BHarO.846...33L. 1927BHarO.846...33L.

[10] Milone, L. A. (1975). "A Note on V CrA and W Men". Information Bulletin on Variable Stars. 989: 1. Bibcode:1975IBVS..989....1M.

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