1998AJ....116..274T


C.D.S. - SIMBAD4 rel 1.7 - 2020.05.25CEST01:56:22

1998AJ....116..274T - Astron. J., 116, 274-283 (1998/July-0)

A search for stars physically associated with the 16 day cepheid X Cygni. II. Clusters in the field.

TURNER D.G.

Abstract (from CDS):

A photometric UBV study is presented for the cluster Ruprecht 175 and the southern portion of the cluster Ruprecht 173, both of which lie in the field of the 16.38 day Cepheid X Cyg. Photoelectric observations for 81 stars and photographic observations for another 142 stars are used with spectroscopic CCD observations for bright cluster stars to investigate the reddening and distance of the Ruprecht 173s/175 complex. The reddening law is described by the relation E_U - B_/E_B - V_ = 0.75, and the ratio of total to selective extinction for the dust clouds in this region of Cygnus is characterized by RA_V_/E_B - V_ = 3.00±0.09 s.e. The dust that obscures most cluster stars is ∼700 pc distant, whereas the cluster complex Ruprecht 173s/175 is located at a distance of 1.22±0.02 kpc (<V0 - M_V_> = 10.43±0.04 s.e.). The cluster complex is very poorly populated and contains only 29 likely B-, A- and F-type members to our survey limit. X Cyg shares a partial spatial coincidence with cluster stars, as well as an inferred similarity in evolutionary status. Its derived luminosity as a cluster member is <M_V_> = -4.87±0.07 s.e., and its derived space reddening is E_B - V_ = 0.25±0.02 [E_B - V_(B0) = 0.28±0.02]. The case for cluster membership is not conclusive, however, and requires confirmation from radial velocity data.

Abstract Copyright:

Journal keyword(s): Stars: Variables: Cepheids - Galaxy: Open Clusters and Associations: General

Nomenclature: Tables 1, 2, 3, 4: Cl* Ruprecht 175 T NNN (Nos 1-81, 101-281).

Status at CDS:   will not be processed
// All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 Cl Collinder 70 OpC 05 35 30 -01 06.0           ~ 57 0
2 * eps Ori s*b 05 36 12.81335 -01 12 06.9089 0.48 1.51 1.69 1.76 1.93 B0Ia 856 0
3 C 1440+697 Cl* 14 40.9 +69 34           ~ 25 0
4 C 1956+203 OpC 19 58 42 +20 29.0           ~ 33 0
5 NAME Cyg Arm PoG 20 02 +40.0           ~ 139 0
6 Ass Cyg OB 1 As* 20 17.8 +37 38           ~ 243 1
7 C 2039+353 OpC 20 41 49 +35 35.1           ~ 10 0
8 V* X Cyg cC* 20 43 24.1918662954 +35 35 16.075732392 8.69 7.70 6.47   5.241 F7Ib 433 0
9 C 2043+353 OpC 20 45 04 +35 30.2           ~ 12 0
10 C 2050+377 OpC 20 52 08 +37 53.7           ~ 21 0
11 NAME Ori Belt reg ~ ~           ~ 65 0

    Equat.    Gal    SGal    Ecl

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