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Discovery of the Host Cluster for the Fundamental Cepheid Calibrator Zeta Gem
- Publication Year :
- 2012
-
Abstract
- New and existing CORAVEL, UBVJHKs, 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(B-V)=0.02+-0.02, log t=7.85+-0.15, and d=355+-15 pc. The mean distance to Zeta Gem from cluster membership and six recent estimates (e.g., IRSB) is d=363+-9(se)+-26(sd) pc. The results presented here support the color-excess and HST parallax derived for the Cepheid by Benedict et al. (2007). 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.<br />Comment: To appear in ApJ Letters
Details
- Database :
- arXiv
- Publication Type :
- Report
- Accession number :
- edsarx.1202.2363
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1088/2041-8205/748/1/L9