J/A+AS/116/403 VRI photometry of stars in 12 BL Lac objects (Fiorucci+, 1996)
VRI photometry of stars in the fields of 12 BL Lacertae objects
Fiorucci M., Tosti G.
<Astron. Astrophys. Suppl. Ser. 116, 403 (1996)>
=1996A&AS..116..403F 1996A&AS..116..403F (SIMBAD/NED BibCode)
ADC_Keywords: BL Lac objects ; Photometry, VRI
Keywords: BL Lacertae objects: general
Description:
We present VRcIc Johnson-Cousins magnitudes of field comparison
stars for twelve BL Lacertae objects belonging to the more large
sample of blazars which is monitored at Perugia Astronomical
Observatory. These comparison stars can be used in the long-term CCD
photometric monitoring of BL Lac objects aimed to understand the
characteristics of their variability. Finding charts for all of these
comparison sequences are also included in this paper.
For a description of the (RI)c photometric system, see e.g. the
General Catalog of Photometric Data GCPD/54
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3 87 58 VRcIc comparison stars in the fields
of BL Lacertae objects
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Byte-by-byte Description of file: table3
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Bytes Format Units Label Explanations
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2- 14 A13 --- Name Names of BL Lac objects and respective
comparison stars
15- 16 I2 h RAh Right ascension (J2000)
18- 19 I2 min RAm Right ascension (J2000)
21- 24 F4.1 s RAs Right ascension (J2000)
26- 27 I2 deg DEd Declination (J2000)
29- 30 I2 arcmin DEm Declination (J2000)
32- 33 I2 arcsec DEs Declination (J2000)
35- 39 F5.2 mag Vmag ? V Johnson magnitude
45- 48 F4.2 mag e_Vmag ? Standard deviation on V magnitude
50- 54 F5.2 mag Rcmag ? Cousins R magnitude
60- 63 F4.2 mag e_Rcmag ? Standard deviation on Rc magnitude
65- 69 F5.2 mag Icmag ? Cousins I magnitude
75- 78 F4.2 mag e_Icmag ? Standard deviation on Ic magnitude
80- 81 I2 --- Number ? Number of nights utilized to calibrate
each star
83- 87 A5 --- Refer References for those objects that have
previously published photometric sequences
in at least one of the VRI filters (1)
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Note (1): Reference numbers are:
1: Bertaud C., Dumortier B., Veron P., et al. (1969), A&A 3, 436.
=1969A&A.....3..436B 1969A&A.....3..436B
2: Penston M. V., Wing R. F. (1973), The Observatory 93, 149.
=1973Obs....93..149P 1973Obs....93..149P
3: Craine E. R. (1977), A Handbook of Quasistellar and BL
Lacertae Objects, Pachart Publishing House, Tucson.
4: Smith P. S., Balonek T. J., Heckert P. A., et al. (1985), AJ 90, 1184
=1985AJ.....90.1184S 1985AJ.....90.1184S
5: Smith P. S., Jannuzi B. T., Elston R. (1991), ApJS 77, 67
=1991ApJS...77...67S 1991ApJS...77...67S
6: Takalo L. O., Sillanpaa A., Nillson K. (1994), A&AS 107, 497
=1994A&AS..107..497T 1994A&AS..107..497T
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(End) Simona Mei [CDS] 13-Oct-1995