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J/A+AS/49/715 New variable stars in Sgr B (Terzan+, 1982)
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New variable stars in the direction of the bright cloud B in Sagittarius
Terzan A., Bijaoui A., Ju K.H., Ounnas C.
<Astron. Astrophys. Suppl. Ser. 49, 715 (1982)>
=1982A&AS...49..715T
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ADC_Keywords: Stars, variable ; Photometry, photographic
Keywords: variable stars - stellar photometry- galactic structure
Description:
621 new variable stars have been detected on plates obtained with the
Schmidt telescopes of the Mount Palomar Observatory (1968) and of the
European Southern Observatory (1976-1980).
The astrometric measurements (ESO-CERN) and the photometrical ones
(CDCA) which have followed the detection the variable stars
(Observatoire de Lyon) have led to determine the parameters {alpha},
{delta}, l, b, R(Max), R(Min), {delta}m.
So we notice that:
- 379 variable stars have an amplitude of variation in magnitude
between 0.5 and 2.0 (delm/N histogram).
-The number of variable stars strongly decreases towards the great
amplitudes.
-The surface density of variable stars by square degree in this
central galactic direction increases from 2 to 21 in the explored
field of 5.5degx5.5deg size.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 45 55 Photometric sequence
table3.dat 81 621 Catalogue of 621 Variable Stars
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See also:
J/A+AS/76/205 (1592 variables and 30 diffuse objects)
J/A+AS/90/451 (1165 variables and 65 diffuse objects)
J/A+AS/123/507 (1061 variables)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq [1/55]+ Sequential number
6- 7 I2 h RAh Right ascension 1950.0
9- 10 I2 min RAm Right ascension 1950.0
12- 15 F4.1 s RAs Right ascension 1950.0
17 A1 --- DE- Declination sign
18- 19 I2 deg DEd Declination 1950.0
21- 22 I2 arcmin DEm Declination 1950.0
24- 27 F4.1 arcsec DEs Declination 1950.0
30- 34 F5.2 mag Rmag Red magnitude
36- 47 A12 --- Name Other name
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Vnum [1/621]+ Variable star number (1)
5- 7 I3 --- T66b ? Name given by Terzan (1966JO.....49..258T),
for the first IR detection of the variable
star
9- 10 I2 h RAh Right ascension 1950.0
12- 13 I2 min RAm Right ascension 1950.0
15- 18 F4.1 s RAs Right ascension 1950.0
20 A1 --- DE- Declination sign
21- 22 I2 deg DEd Declination 1950.0
24- 25 I2 arcmin DEm Declination 1950.0
27- 30 F4.1 arcsec DEs Declination 1950.0
32- 37 F6.2 deg GLON Galactic longitude (2)
39- 42 F4.2 deg GLAT Galactic latitude (2)
44 A1 --- l_Rmax Limit flag on Rmax
45- 49 F5.2 mag Rmax Red maximum magnitude
51- 52 I2 --- n_Rmax ? Plate characteristic number (see
"Table 1" section below)
54 A1 --- l_Rmin Limit flag on Rmin
55- 59 F5.2 mag Rmin []? Minimun red magnitude
61- 62 I2 --- n_Rmin []? Plate characteristic number (see table1)
64- 67 F4.2 mag DRmag []? Observed amplitude Rmin - Rmax
69- 70 I2 --- Nplate ? Number of plates for which the star have
been measured
72- 85 A14 --- Rem Remarks (3)
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Note (1): The stars from this list are named Terz Vnnn in the literature
Note (2): Galactic coordinates from the Lund tables with {alpha}=12h49min
and {delta}=+27.4deg (1950.0) for the galactic pole.
Note (3): Remarks concerning above all the 32 variable stars where R(Max) and
R(Min) were obtained with the iris photometer: IR.PH.
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Table 1: Plates characteristics
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N Plate Date Emulsion Filter Exp. Seeing Observatory
number
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1 SE.88 1958.04.17 103AE PG2444 40mn - POSS
2 3753 1968.06.24 103AE RG610 20mn 2" Palomar
3 3806 1968.06.29 103AE RG610 20mn 2" Palomar
4 1582 1976.07.20 103AE RG630 60mn 7/8"+image motion ESO
5 1599 1976.08.18 103AE RG630 60mn 2/3" ESO
6 1600 1976.08.18 103AE RG630 30mn 4/5" ESO
7 2268 1977.08.31 098.04 RG630 30mn 3/4" ESO
8 2830 1978.07.08 103AE RG630 30mn 6"+wind ESO
9 3242 1979.05.03 098.04 RG630 30mn 6"+strong wind ESO
10 3267 1979.05.26 103AE RG630 30mn 5" ESO
11 3275 1979.05.31 103AE RG630 30mn 4/5" ESO
12 3289 1979.06.19 098.04 RG630 30mn 4/5" ESO
13 3296 1979.06.30 098.04 RG630 30mn 7"+wing ESO
14 3300 1979.07.16 098.04 RG630 30mn 4" ESO
15 3329 1979.08.16 103AE RG630 30mn 5" ESO
16 3700 1980.03.24 098.04 RG630 30mn 5" ESO
17 3715 1980.04.16 098.04 RG630 30mn 3" ESO
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References:
Terzan A., 1966, J. Obser. 49, 224
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Historical notes: Keypunched at CDS
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(End) Marie-Jose Wagner, Patricia Bauer [CDS] 05-Dec-1994