J/AJ/107/2101 Berkeley 93 RVB photometry (Saure+ 1994)
Berkeley 93: a distant star cluster nestled in a dust cloud
Saurer W., Seeberger R., Weinberger R., Ziener R.
<Astron. J. 107, 2101 (1994)>
=1994AJ....107.2101S 1994AJ....107.2101S
ADC_Keywords: Photometry, CCD ; Clusters, open
Abstract:
While performing galactic and extragalactic studies near the galactic
plane in Cepheus. CCD frames in B, V, and R were taken of the faint
(V≥16m), previously unstudied open star cluster Berkeley 93 (Be 93).
Our results indicate that this object is the core of a larger
aggregate, is slightly evolved, strongly reddened [E(B-V)∼1.5], and
shows a pronounced variable reddening that is probably due to the
location of the cluster inside (near the border) a dust cloud. By far
the reddest, and obviously most evolved star is a (variable) carbon
star that-because of its reddening and location-appears to be a
cluster member. We present arguments in favour of a large distance of
more than 5kpc for Be 93 which possibly belongs to the galactic warp.
As an addendum, we present six star concentrations discovered on the
POSS or ESO/SERC atlas that might represent hitherto uncatalogued open
star clusters of "Berkeley type."
Objects:
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RA (2000) DE Designation(s)
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21 56.2 +63 56 Berkeley 93 = C 2154+637
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 96 216 Photometry of stars in Berkeley 93
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Star sequential number
5- 9 F5.2 mag Rmag R magnitude
11- 15 F5.2 mag Vmag V magnitude
17- 21 F5.2 mag Bmag ? B magnitude
23- 26 F4.2 mag V-R V-R colour index
28- 31 F4.2 mag B-V ? B-V colour index
33 A1 --- Member [C] C: cluster star; blank: field star
35- 36 I2 h RAh Right Ascension J2000 (hours) (1)
38- 39 I2 min RAm Right Ascension J2000 (minutes) (1)
41- 45 F5.2 s RAs Right Ascension J2000 (seconds) (1)
47 A1 --- DE- Declination J2000 (sign) (1)
48- 49 I2 deg DEd Declination J2000 (degrees) (1)
51- 52 I2 arcmin DEm Declination J2000 (minutes) (1)
54- 57 F4.1 arcsec DEs Declination J2000 (seconds) (1)
59 A1 --- rPos [bgMs] Source of the position (2)
62- 96 A35 --- Com Comments from B. Skiff (1)
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Note (1): Columns not in the original paper, added by B. Skiff in July 2003
Note (2): the origin of the position is as follows:
b USNO-B1.0 (2003AJ....125..984M 2003AJ....125..984M, Cat. I/284)
g GSC-2.2 (2001GSC2..C......0S 2001GSC2..C......0S, Cat. I/271)
M 2MASS (Cat. II/246)
s SkyView estimate (±2")
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History:
* 25-Mar-1997: Prepared via OCR at CDS.
* 29-Jul-2003: Positions added (B. Skiff, Lowell Observatory)
(End) James Marcout, Patricia Bauer [CDS]; Brian skiff [Lowell] 29-Jul-2003