NEW
SUSPECTED VARIABLE STAR IN CRUX
Buso,
Victor A. (victorbuso@infovia.com.ar);
Ballan, Gustavo E. (gballan@infovia.com.ar);
Mansilla, Luis A. (luismansilla@ciudad.com.ar);
Bustos, Fabian A.;
Severi, Leonardo (lseveri@terra.com.br);
Pintado, Olga Ines (opintado@tucbbs.com.ar)
Observatorio
Astronómico del Colegio Cristo Rey. Rosario, Argentina
Coordinator: Víctor Ángel Buso
Entre Rios 2974
CP. 2000 Rosario
ARGENTINA
ABSTRACT
We present data of a new suspected variable star in the constellation Crux.
This is a result of a photographic scanning program at the Observatorio
Cristo Rey, which began in 1995. Unfiltered CCD photometric data show that
IRAS12521-6034 is a variable star.
Star
name: IRAS 12521-6034
Equatorial coordinates (field):
The star for which a change of brightness has been detected is:
AR (2000.0): 12h 55m 09.5s
Dec (2000.0): -60º 50' 59"
Cross references: IRAS 12521-6034.
Observatory
and Telescope:
OBSERVATORIO ASTRONOMICO DEL COLEGIO CRISTO REY
In Rosario - Argentina.
Long: W 60 38 06.5
Lat: S 32 57 12.7
Alt: 50 Meters
*
Refractor, 60 mm. diameter, 240 mm. focal lenght.
Detector:
* Meade's Pictor 416, filterless, with a Kodak's KAF-0400 CCD chip. Pixel: 768
x 512, Size: 6.9mm x 4.60mm,Pixel Size: 7.73", Field view: 99´x 66´
(arcminute).
* Santa Barbara's SBIG ST-4, filterless, with a Texas
Instruments' TI-255 CCD chip. Pixel: 192 x 165, Size: 2.64mm x 2.64mm, Pixel
Size: 11.75" x 13.66", Field
view: 37´x 37´(arcminute).
Date(s)
of observation(s):
Differential
magnitudes (DifMag) DifMag = MVar - MRef", where:
MRef:
CCD Magnitude of the star SAO 252084 (CCD = SBIG ST4, filterless)
MVar:
Magnitude of the suspected (CCD = SBIG ST4, filterless)
Date(s)
of observation(s):
BRIGHTNESS
VARIATION OBSERVED
Measure
with SBIG ST-4
Date Time
Julian Instrumental
(UT) (UT)
Date magnitude differences
-----------------------------------------------
1995 Mar 22 01:16 2449798.55307
1.22
1995 May 31 00:20 2449868.51418
1.42
1995 Jun 03 02:19 2449871.59682
1.52
1995 Jun 06 02:00 2449874.58362
1.51
1995 Jun 22 00:15 2449890.51024
1.81
1995 Jun 27 01:19 2449895.55469
2.01
1995 Jun 30 01:24 2449898.55816
2.39
1995 Jul 01 00:46 2449899.53188
2.14
1995 Jul 07 01:30 2449905.56274
2.25
1995 Jul 08 00:57 2449906.53951
2.01
1995 Jul 18 01:57 2449916.58164
2.44
1996 Ene 26 03:00 2450108.62522 >5.28
1996 Feb 27 04:08 2450140.67231
>5.28
1996 Abr 18 01:37 2450191.56789
>5.28
1996 May 21 01:37 2450224.56789
2.08
1996 Jun 22 02:04 2450256.58670
2.34
1996 Jul 04 23:22 2450269.47384
2.24
1996 Ago 10 01:53 2450305.57873
2.97
1997 Feb 14 03:45 2450493.65653 >5.28
1997 May 06 00:05 2450574.50355 >5.28
1997 May 29 00:35 2450597.52486 >5.28
1997
Jun 07 00:43 2450606.52994 >5.28
1998 Mar 25 02:58 2450897.62377 >5.28
1998 May 20 23:05 2450954.46227
>5.28
1999 Jun 11 01:01 2451340.54248 >5.28
1999 Ago 28 00:54 2451418.53814 >5.28
1999 Ago 29 00:56 2451419.53935
>5.28
Range
of variability:
10.44 - > 14.50
BRIGHTNESS
VARIATION OBSERVED
Measure
with Pictor 416
Date Time
Julian Instrumental
(UT) (UT)
Date magnitude differences
2000
Oct 21 07:31 2451838.81340
7.37
2001 Feb 13 08:19 2451953.84656
8.51
2001 Feb 17 07:43 2451957.82203
8.63
2001 Feb 21 03:26 2451961.64339
8.63
2001 Feb 27 04:26 2451967.68491
7.98
2001 Mar 07 02:56 2451975.62289 >9.28
2001 Mar 14 05:28 2451982.72809
>9.28
2001 Mar 27 04:51 2451995.70225 >9.28
Range
of variability: 10.44 - > 18.50 mag.
Comparison star(s):
SAO
252084 = HD 112027 = HIP 62982 = TYC 8989 3049 1. m=9.22V. B-V=0.59
Check
star(s):
SAO
252085 = HD 112026 = PPM 359736
HD
312129 = PPM 779212 = GSC 8989 1603
HD
312130 = GSC 8989 0710
CP
-60 4360 = GSC 8989 1143
Transformed to a standard system:
NO
if yes: which one:
standard stars (field) used:
Availability of the data (upon request, database, URL etc.)
If data are sent together with the template file, the editors will make it
publicly available through the
IBVS Web-site
http://ar.geocities.com/astrosud/new_suspected.htm
Type of variability (according to
the GCVS nomenclature if known): I (irregular)
Identification chart: YES
Remarks:
A scanning program for
searching variable star is running at Observatorio Cristo Rey. This program
consist in taking CCD images of the same field throughout the time and compare
them to detect luminosity changes in the stars in the field.
When a change of
luminosity is detected, we cross references to the following catalogues:
General Catalogue of Variable Stars (GCVS), New Suspected Variable Stars
Catalogue and its supplement (NSV and NSVS), Hipparcos Catalogue, Guide Star
Catalogue, Tycho-1 and Tycho-2 catalogues, USNO Catalogue, IRAS and others.
As a result of this
program we have found a variable star in Crux (Southern Cross)at AR (2000.0):
12h 55m 09.5s Dec (2000.0): -60º 50' 59"
Acknowledgements:
References:
