J/ApJ/87/361 Variable stars in M92 (Nassau+, 1938)
A study of the globular cluster Messier 92.
Nassau J.J.
<Astrophys. J., 87, 361-366 (1938)>
=1938ApJ....87..361N 1938ApJ....87..361N
ADC_Keywords: Clusters, globular ; Stars, variable ; Photometry, photographic
Abstract:
The distance modulus of M92 is determined from the bright stars and
the mean magnitude of 12 cluster-type variables. From the former,
m-M=14.93; and from the latter, m-M=14.94±0.01. Two variables not
belonging to the cluster are indicated, as well as two other stars
with range in variation of 0.25mag, which are marked as probable
variables.
From star counts, the ratio of the minor to the major axis is found
to be 0.85, with a position angle of the major axis of 28°.
Sensitometer tracings give 14' for the diameter of the cluster.
Description:
The observations were made with the reflector at the Perkins
Observatory during the summer of 1936, and on 2 nights in June 1937.
The exposures ranged from 6min to 1hour; the majority of the plates
were exposed 15min.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 36 14 Variable stars observed in M92
table1.dat 82 38 Observations of variable stars in M92
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See also:
V/97 : Updated 3rd Cat Variable Stars in Globular Clusters (Clement+ 1997)
J/A+A/369/862 : VI light curves of the variable stars in M92 (Kopacki, 2001)
J/A+A/458/767 : Vilnius photometry on M92 (Smriglio+, 2006)
J/AJ/129/2714 : JHK photometry of M92 variable stars (Del Principe+, 2005)
J/AJ/133/1041 : Velocities and CMT photometry in globular M92 (Drukier+, 2007)
J/AJ/142/22 : Heavy-element dispersion in M92 (Roederer+, 2011)
Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq [1/14] Star number, as in table1
4- 5 I2 --- Vno [1/15] Variable star number in Sawyer Hogg (1)
7- 8 I2 h RAh Simbad Hour of Right Ascension (J2000.0)
10- 11 I2 min RAm Simbad Minute of Right Ascension (J2000.0)
13- 17 F5.2 s RAs Simbad Second of Right Ascension (J2000.0)
18 A1 --- DE- Simbad Sign of the Declination (J2000.0)
19- 20 I2 deg DEd Simbad Degree of Declination (J2000.0)
22- 23 I2 arcmin DEm Simbad Arcminute of Declination (J2000.0)
25- 28 F4.1 arcsec DEs Simbad Arcsecond of Declination (J2000.0)
32- 36 F5.2 mag mag Average photographic magnitude (from table1)
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Note (1): "Vno" is the star number from Sawyer Hogg (Cat. V/97)
<Cl* NGC 6341 SAW VNN> in Simbad.
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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- 12 F12.4 d HJD [2428362/2428698] Heliocentric Julian Time
14- 17 F4.1 --- N1 ? Photographic magnitude for star #1 (V3)
19- 22 F4.1 --- N2 ? Photographic magnitude for star #2 (V6)
24- 27 F4.1 --- N3 ? Photographic magnitude for star #3 (V2)
29- 32 F4.1 --- N4 ? Photographic magnitude for star #4 (V8)
34- 37 F4.1 --- N5 ? Photographic magnitude for star #5 (V7)
39- 42 F4.1 --- N6 ? Photographic magnitude for star #6 (V5)
44- 47 F4.1 --- N7 ? Photographic magnitude for star #7 (V1)
49- 52 F4.1 --- N8 ? Photographic magnitude for star #8 (V4)
54- 57 F4.1 --- N9 ? Photographic magnitude for star #9 (V9)
59- 62 F4.1 --- N10 ? Photographic magnitude for star #10 (V12)
64- 67 F4.1 --- N11 ? Photographic magnitude for star #11 (V11)
69- 72 F4.1 --- N12 ? Photographic magnitude for star #12 (V15)
74- 77 F4.1 --- N13 ? Photographic magnitude for star #13 (V10)
79- 82 F4.1 --- N14 ? Photographic magnitude for star #14 (V13)
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History:
Prepared by Wayne H. Osborn (Michigan Univ.)
(End) Francois Ochsenbein [CDS] 17-Jan-2013