TOWARDS A DETERMINATION OF DEFINITIVE PARAMETERS FOR THE LONG PERIOD CEPHEID S VULPECULAE

Автор(и)

  • D. G. Turner Department of Astronomy and Physics, Saint Mary's University, Канада

DOI:

https://doi.org/10.18524/1810-4215.2013.26.82308

Ключові слова:

stars, variables, Cepheids, fundamental parameters, Galaxy, open clusters and associations, individual.

Анотація

A new compilation of  UBV data for stars near the Cepheid S Vul incorporates BV observations from APASS and NOMAD to augment UBV observations published previously. A reddening analysis yields mean colour excesses and distance moduli for two main groups of stars in the field: the sparse cluster Turner1 and an anonymous background group of BA stars. The former appears to be 1.07 ± 0.12 kpc distant and reddened by EB−V =0.45 ± 0.05, with an age of 109 yrs. The previously overlooked latter group is 3.48 ± 0.19kpc distant and reddened by EB−V =0.78 ± 0.02,with an age of1.3 × 107 yrs. Parameters inferred for S Vul under the assumption that it belongs to the distant group, as also argued by 2MASS data, are all consistent with similar results for other cluster Cepheids and Cepheid-like supergiants. 

Посилання

Berdnikov, L.N.: 1993, AstL, 19, 84.

Berdnikov, L.N.: 1994, AstL, 20, 232.

Berdnikov, L.N.: 2007,http://www.sai.msu.ru/groups /cluster/CEP/PHE.

Evans N.R., Massa, D., Proffitt, C.: 2009, AJ, 137, 3700.

Evans, N.R., et al.: 2011, AJ, 142, 87.

Fernie, J.D.: 1970, AJ, 75, 244.

Heiser, A.H.: 1996, PASP, 108, 603.

Joy, A.H.: 1952, ApJ, 115, 25.

Mahmoud, F., Szabados, L.: 1980, IBVS, 1895, 1.

Majaess, D., et al.: 2013, Ap&SS,in press.

Meynet, G., Mermilliod, J.-C., Maeder, A.:1993, A&AS, 98, 477.

Monson, A.J., et al.: 2012, ApJ, 759, 146.

Nassau, J.J., Ashbrook, J.: 1943, AJ, 50, 97.

Pietrzy˜nski, G., et al.: 2010, Nature, 468, 542.

Turner, D.G.: 1976, AJ, 81, 97.

Turner, D.G.: 1980, ApJ, 235, 146.

Turner, D.G.: 1985, JRASC, 79, 175.

Turner, D.G.: 1989, AJ, 98, 2300.

Turner, D.G.: 1996, JRASC, 90, 82.

Turner, D.G.: 2010, Ap&SS, 326, 219.

Turner, D.G.: 2011, RMxAA, 47, 127.

Turner, D.G.: 2012, JAAVSO, 40, 502.

Turner, D.G., Leonard, P.J.T., Madore, B.F.: 1986, JRASC, 80, 166.

Turner, D.G., et al.: 2009, AN, 330, 807.

Turner, D.G., et al.: 2012a, MNRAS, 422, 2501.

Turner, D.G., et al.: 2012b, AJ, 144, 187.

Tsarevskii, G.S.: 1971, SvA, 15, 169.

Wildey, R.L., et al.: 1962, ApJ, 135, 94.

Zacharias N., et al.: 2005, BAAS, 36, 1418.

##submission.downloads##

Опубліковано

2013-11-07

Номер

Розділ

Статті