Details

Autor(en) / Beteiligte

• Majaess, D
• Turner, D
• GIEREN, W
• Balam, D
• Lane, D

Titel

DISCOVERY OF THE HOST CLUSTER FOR THE FUNDAMENTAL CEPHEID CALIBRATOR ZETA GEMINORUM

Ist Teil von

• Astrophysical journal. Letters, 2012-03, Vol.748 (1), p.1-5

Ort / Verlag

United States

Erscheinungsjahr

2012

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• New and existing CORAVEL, UBVJHK sub(S), HST, HIP/Tycho, ARO, KPNO, and DAO observations imply that the fundamental Cepheid calibrator [zeta] Gem is a cluster member. The following parameters were inferred for [zeta] Gem from cluster membership and are tied to new spectral classifications (DAO) established for 26 nearby stars (e.g., HD53588/B7.5IV, HD54692/B9.5IV): E sub(B-V) = 0.02+ or -0.02, log [tau] = 7.85+ or -0.15, and d = 355+ or -15 pc. The mean distance to [zeta] Gem from cluster membership and six recent estimates (e.g., IRSB) is d = 363 + or - 9([sigma] sub(x)) + or - 26([sigma]) pc. The results presented here support the color-excess and HST parallax derived for the Cepheid by Benedict et al. Forthcoming precise proper motions (DASCH) and Chandra/XMM-Newton observations of the broader field may be employed to identify cluster members, bolster the cluster's existence, and provide stronger constraints on the Cepheid's fundamental parameters.