ANCHORING THE DISTANCE SCALE VIA X-RAY/INFRARED DATA FOR CEPHEID CLUSTERS: SU Cas
Journal Article
·
· Astrophysical Journal
- Department of Astronomy and Physics, Saint Mary's University, Halifax, NS B3H 3C3 (Canada)
- Departamento de Astronomia, Universidad de Concepcion, Casilla 160-C, CL Concepcion (Chile)
- Departamento de Astronomia, Universidade Federal do Rio Grande do Sul, Av. Bento Goncalves, 9500 Porto Alegre, RS (Brazil)
- Dominion Astrophysical Observatory, Victoria, BC (Canada)
- Moscow M V Lomonosov State University, Sternberg Astronomical Institute, Moscow 119992 (Russian Federation)
New X-ray (XMM-Newton) and JHK{sub s} (Observatoire du Mont-Megantic) observations for members of the star cluster Alessi 95, which Turner et al. discovered hosts the classical Cepheid SU Cas, were used in tandem with UCAC3 (proper motion) and Two Micron All Sky Survey observations to determine precise cluster parameters: E(J - H) = 0.08 {+-} 0.02 and d = 405 {+-} 15 pc. The ensuing consensus among cluster, pulsation, and trigonometric distances (d=414{+-}5({sigma}{sub x}-bar){+-}10 ({sigma}) pc) places SU Cas in a select group of nearby fundamental Cepheid calibrators ({delta} Cep, {zeta} Gem). High-resolution X-ray observations may be employed to expand that sample as the data proved pertinent for identifying numerous stars associated with SU Cas. Acquiring X-ray observations of additional fields may foster efforts to refine Cepheid calibrations used to constrain H{sub 0}.
- OSTI ID:
- 22039390
- Journal Information:
- Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 2 Vol. 753; ISSN ASJOAB; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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