2012ApJ...748L...9M

Query : 2012ApJ...748L...9M

2012ApJ...748L...9M - Astrophys. J., 748, L9 (2012/March-3)

Discovery of the host cluster for the fundamental cepheid calibrator zeta Geminorum.

MAJAESS D., TURNER D., GIEREN W., BALAM D. and LANE D.

Abstract (from CDS):

New and existing CORAVEL, UBVJHKs, HST, HIP/Tycho, ARO, KPNO, and DAO observations imply that the fundamental Cepheid calibrator ζ Gem is a cluster member. The following parameters were inferred for ζ 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 τ = 7.85±0.15, and d = 355±15 pc. The mean distance to ζ Gem from cluster membership and six recent estimates (e.g., IRSB) is d = 363 ± 9σ{bar}x) ± 26(σ 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.

Abstract Copyright: ∼

Journal keyword(s): Hertzsprung-Russell and C-M diagrams - open clusters and associations: general - stars: distances - stars: variables: Cepheids

Nomenclature: Table 1: [MTG2012b] JHHMMSS.s+DDMMSS.s N=6.

Simbad objects: 40

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Number of rows : 40
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 * alf UMi B V* 02 30 36.0860424600 +89 15 39.203145900   8.69 8.20     F3V 37 0
2 Cl Melotte 22 OpC 03 46 24.2 +24 06 50           ~ 3434 0
3 Cl Melotte 25 OpC 04 29 47.3 +16 56 53           ~ 3074 0
4 HD 263791 * 06 47 33.3832380816 +18 56 30.636071772   8.95 8.98     A0 12 0
5 HD 49381 * 06 49 08.5862742984 +23 12 06.943207284   6.80 6.79     A0 12 0
6 HD 49824 * 06 51 07.9734924384 +21 25 41.799507708   9.06 8.99     A3 11 0
7 HD 50107 * 06 52 39.6245581680 +23 00 36.996730308   8.86 8.84     A0 5 0
8 HD 50164 * 06 52 50.7308014728 +20 22 27.643452348   8.90 8.94     A2 12 0
9 HD 50509 * 06 54 22.1453662632 +19 35 42.760525596   7.94 8.04     B8 11 0
10 HD 50634 * 06 54 56.7503774664 +21 34 16.935485592   6.94 6.97     B9 21 0
11 HD 50767 * 06 55 37.1980480296 +24 00 28.902678516   7.59 7.75     B2V 30 0
12 HD 51102 * 06 56 48.5687688816 +20 58 01.822740888   7.31 7.41     B8 11 0
13 HD 51187 * 06 57 12.0564046320 +20 29 44.175217452   9.02 9.01     A0 3 0
14 HD 51354 Be* 06 57 42.9025797024 +17 54 07.237439316 6.29 7.02 7.16     B3ne 62 0
15 HD 51353 * 06 57 46.0135371072 +20 27 59.076077616   7.67 7.75     B9 11 0
16 TYC 1352-582-1 * 06 58 15.0298989024 +18 47 05.971178220   9.70 9.56     ~ 2 0
17 HD 51971 * 07 00 19.4350655520 +18 40 03.927777636   9.46 9.40     A 5 0
18 HD 52372 * 07 01 45.5443952544 +17 58 31.257085332   7.60 7.55     A2 12 0
19 HD 52371 * 07 01 46.0860002712 +20 03 17.346122136   7.92 7.99     A0 9 0
20 V* V335 Gem EB* 07 02 05.5288667952 +21 47 53.123996472   7.90 7.91     B9 20 0
21 HD 52474 * 07 02 13.4700753480 +20 49 41.561385240   7.88 7.82     A2 16 0
22 TYC 1356-1008-1 * 07 03 23.0925225888 +20 37 59.453741784   11.94 11.51     ~ 1 0
23 [MTG2012b] J070338.7+204059.0 * 07 03 38.70 +20 40 59.0   12.59 12.00     ~ 1 0
24 2MASS J07035262+2035162 * 07 03 52.6247477544 +20 35 16.239985152   12.88 12.34     F7V 2 0
25 * zet Gem cC* 07 04 06.5312384690 +20 34 13.074474962 5.20 4.58 3.79   3.082 G1Ib 569 0
26 2MASS J07041267+2030196 * 07 04 12.6753385320 +20 30 19.628284392   12.40 11.83     F6V 1 0
27 UCAC2 39130002 * 07 04 12.7311924696 +20 34 21.301131144   11.87 11.46 11.36   G0V 2 1
28 [MTG2012b] J070428.6+203447.3 * 07 04 28.60 +20 34 47.3   12.90 12.37     ~ 1 0
29 BD+18 1470 Pe* 07 04 39.3016082496 +18 10 36.737337720   9.92 10.03     B9IV-VCrEuSi 6 0
30 UCAC4 553-036241 * 07 04 40.3628889216 +20 35 13.152959844   12.84 12.42 12.37   ~ 2 0
31 HD 53288 * 07 05 14.9228732880 +19 49 28.611870888 8.740 8.820 8.840     A0 14 0
32 HD 53230 * 07 05 17.0597129304 +23 10 02.491015512   8.96 8.88     A2 15 0
33 HD 53473 * 07 05 56.9574340464 +19 45 11.264591448   9.18 9.15     A0 10 0
34 HD 53588 * 07 06 17.4117600264 +17 44 39.850079820 6.690 7.090 7.200     B9 25 0
35 HD 54404 * 07 09 25.4749114968 +18 32 59.527860936   8.40 8.41 8.5   A0 16 0
36 HD 54692 * 07 10 40.0497786864 +19 19 43.809094020   8.51 8.53     A0 14 0
37 HD 55919 * 07 15 42.8018155056 +19 50 50.461608156   7.34 7.44     B9 15 0
38 HD 57070 * 07 20 30.3954527376 +20 06 54.728961048   8.10 8.15     B9 11 0
39 NAME Coma Dwarf Galaxy G 12 26 59.0 +23 54 15     14.1     ~ 452 1
40 * del Cep cC* 22 29 10.2626640314 +58 24 54.697613650 4.71 4.35 3.75   3.219 F5Iab:+B7-8 730 0

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