J/MNRAS/388/444 Berkeley 58 & CG Cas UBV photometry (Turner+, 2008)
Galactic clusters with associated Cepheid variables.
VII. Berkeley 58 and CG Cassiopeiae.
Turner D.G., Forbes D., English D., Leonard P.J.T., Scrimger J.N.,
Wehlau A.W., Phelps R.L., Berdnikov L.N., Pastukhova E.N.
<Mon. Not. R. Astron. Soc., 388, 444-456 (2008)>
=2008MNRAS.388..444T 2008MNRAS.388..444T
ADC_Keywords: Clusters, open ; Stars, variable ; Photometry, UBV
Keywords: stars: evolution - Cepheids -
open clusters and associations: individual: Berkeley 58
Abstract:
Photoelectric, photographic and CCD UBV photometry, spectroscopic
observations and star counts are presented for the open cluster
Berkeley 58 to examine a possible association with the 4.37d Cepheid
CG Cas. The cluster is difficult to separate from the early-type stars
belonging to the Perseus spiral arm, in which it is located, but has
reasonably well-defined parameters: an evolutionary age of ∼108yr,
a mean reddening of E(B-V)(B0)=0.70±0.03 s.e. and a distance of
3.03±0.1kpc (V0-MV=12.40±0.12 s.d.). CG Cas is a likely
cluster coronal member on the basis of radial velocity, and its period
increase of +0.170± 0.01s/y and large light amplitude describe a
Cepheid in the third crossing of the instability strip lying slightly
blueward of strip centre. Its inferred reddening and luminosity are
E(B-V)=0.64±0.02 s.e. and <MV≥-3.06±0.12. A possible K
supergiant may also be a cluster member.
Description:
A variety of observations were obtained for the present investigation.
Photoelectric UBV photometry for bright members of Berkeley 58, were
obtained during observing runs at Kitt Peak National Observatory in
1981 September, 1982 August and 1984 August. The data were acquired
using 1P21 photomultipliers and standard UBV filter sets used in
conjunction with pulse-counting photometers on the No. 4 0.4-m, No. 2
0.9-m, and 1.3-m telescopes at Kitt Peak.
Objects:
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RA (2000) DE Designation(s)
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00 01 59.3 +60 57 32 CG Cas = V* CG Cas
00 00 00. +60 58 Berkeley 58 = Cl Berkeley 58
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 103 40 Photoelectric UBV data for stars in Berkeley 58
(Numbers 0 (CG Cas) to 37)
table3.dat 50 155 Photographic UBV Data for Stars in Berkeley 58
(Numbers 101 to 255)
table4.dat 50 326 CCD UBV Data for Stars in the Nucleus of
Berkeley 58 (Numbers 1001 to 1411)
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See also:
J/AJ/113/2104 : UBV photometry of 163 stars around SU Cyg (Turner+ 1997)
Byte-by-byte Description of file: table1.dat table3.dat table4.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Star Sequential number, 0 for CG Cas,
Cl* Berkeley 58 TFE NNNN in Simbad
5 A1 --- n_Star [*] Modifications (1)
7- 8 I2 h RAh Right ascension (J2000)
10- 11 I2 min RAm Right ascension (J2000)
13- 17 F5.2 s RAs Right ascension (J2000)
20 A1 --- DE- Declination sign (J2000)
21- 22 I2 deg DEd Declination (J2000)
24- 25 I2 arcmin DEm Declination (J2000)
27- 30 F4.1 arcsec DEs Declination (J2000)
33- 37 F5.2 mag Vmag V magnitude
39- 43 F5.2 mag B-V B-V colour index
46- 50 F5.2 mag U-B ?=- U-B colour index
52- 54 A3 --- N Number of individual observations or CCD (2)
56-103 A48 --- Notes Notes (2)
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Note (1): duplicated numbers changed at CDS:
* Star No 24 has No 23 in original file
* Star No 36 has No 37 in original file
Note (2): For table1.dat only
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History:
From electronic version of the journal
References:
Turner, Paper I 1986AJ.....92..111T 1986AJ.....92..111T
Turner et al., Paper II 1992AJ....104.1132T 1992AJ....104.1132T
Turner, Paper III 1992AJ....104.1865T 1992AJ....104.1865T
Turner et al., Paper IV 1994AJ....107.1796T 1994AJ....107.1796T
Turner et al., Paper V 1997AJ....113.2104T 1997AJ....113.2104T, Cat. J/AJ/113/2104
Turner et al., Paper VI 1998AJ....115.1958T 1998AJ....115.1958T
(End) Patricia Vannier [CDS] 23-Dec-2008