SIMBAD references

2010ApJS..186..191C - Astrophys. J., Suppl. Ser., 186, 191-221 (2010/February-0)

The stellar population of h and χ Persei: cluster properties, membership, and the intrinsic colors and temperatures of stars.

CURRIE T., HERNANDEZ J., IRWIN J., KENYON S.J., TOKARZ S., BALOG Z., BRAGG A., BERLIND P. and CALKINS M.

Abstract (from CDS):

From photometric observations of ∼ 47,000 stars and spectroscopy of ∼ 11,000 stars, we describe the first extensive study of the stellar population of the famous Double Cluster, h and χ Persei, down to subsolar masses. By analyzing optical spectra and optical/infrared photometry, we constrain the distance moduli (dM), reddening (E(B - V)), and ages for h Persei, χ Persei, and the low-density halo population surrounding both cluster cores. With the exception of mass and spatial distribution, the clusters are nearly identical in every measurable way. Both clusters have E(B - V) ∼ 0.52-0.55 and dM = 11.8-11.85; the halo population, while more poorly constrained, likely has identical properties. As determined from the main-sequence turnoff, the luminosity of M supergiants, and pre-main-sequence isochrones, ages for h Persei, χ Persei, and the halo population all converge on {&x2248;}14 Myr, thus showing a stunning agreement between estimates based on entirely different physics. From these data, we establish the first spectroscopic and photometric membership lists of cluster stars down to early/mid M dwarfs. At minimum, there are ∼ 5000 members within 10' of the cluster centers, while the entire h and χ Persei region has at least ∼ 13,000 and as many as 20,000 members. The Double Cluster contains {&x2248;} 8400 M of stars within 10' of the cluster centers. We estimate a total mass of at least 20,000 M. We conclude our study by outlining outstanding questions regarding the past and present properties of h and χ Persei. From comparing recent work, we compile a list of intrinsic colors and derive a new effective temperature scale for O-M dwarfs, giants, and supergiants.

Abstract Copyright:

Journal keyword(s): open clusters and associations: individual (NGC 869, NGC 884) - stars: pre-main sequence

VizieR on-line data: <Available at CDS (J/ApJS/186/191): table1.dat table2.dat table3.dat table6.dat>

Nomenclature: Table 1: [CHI2010] PNNNNN (Nos P1-P47060). Table 2: [CHI2010] SNNNNN (Nos S1-S11309). Table 3: [CHI2010] NNNN (Nos 1-7465). Table 6: [CHI2010] h Per MNNNNN (Nos M1-M13424), [CHI2010] chi Per MNNNNN (Nos M1-M4720).

Simbad objects: 4740

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2019.10.20-17:58:57

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