Mon. Not. R. Astron. Soc., 422, 2501-2509 (2012/May-3)
Alessi 95 and the short-period cepheid SU Cassiopeiae.
TURNER D.G., MAJAESS D.J., LANE D.J., BALAM D.D., GIEREN W.P., STORM J., FORBES D.W., HAVLEN R.J. and ALESSI B.
Abstract (from CDS):
The parameters for the newly discovered open cluster Alessi 95 are established on the basis of available photometric and spectroscopic data, in conjunction with new observations. Colour excesses for spectroscopically observed B- and A-type stars near SU Cas follow a reddening relation described by E(U-B)/E(B-V) = 0.83 + 0.02E(B-V), implying a value of R=AV/E(B-V) ≃ 2.8 for the associated dust. Alessi 95 has a mean reddening of E(B-V)(B0) = 0.35±0.02 s.e., an intrinsic distance modulus of V0-MV= 8.16±0.04 s.e. (±0.21 s.d.), d= 429±8 pc, and an estimated age of 108.2 yr from zero-age main sequence (ZAMS) fitting of available UBV, CCD BV, NOMAD, and Two Micron All Sky Survey JHKs observations of cluster stars. SU Cas is a likely cluster member, with an inferred space reddening of E(B-V) = 0.33±0.02 and a luminosity of <MV>=-3.15 ± 0.07 s.e., consistent with overtone pulsation (PFM= 2.75 d), as also implied by the Cepheid's light-curve parameters, rate of period increase and Hipparcos parallaxes for cluster stars. There is excellent agreement of the distance estimates for SU Cas inferred from cluster ZAMS fitting, its pulsation parallax derived from the infrared surface brightness technique and Hipparcos parallaxes, which all agree to within a few per cent.
2012 The Authors. Monthly Notices of the Royal Astronomical Society2012 RAS
stars: individual: SU Cas - stars: variables: Cepheids - open clusters and associations: individual: Alessi 95
* ARO 3 = TYC 4313-355-1, FM-A = BD +68 201, T.1 : stars TE are : TE 1 = 2MASS J02514860+6852575, TE 2 = 2MASS J02520193+6850380, TE 3 = TYC 4313-1114-1, TE 4 = 2MASS J02520904+6847133, TE5 = TYC 4313-4038-1, TE 6 = 2MASS J02530733+6853019, TE 7 = 2MASS J02522817+6855329, TE 8 = 2MASS J02522874+6854484
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