J/A+AS/132/361 Optical observations of eight BL Lacs (Raiteri+ 1998)
Optical observations of eight X-ray selected BL Lacertae objects
Raiteri C.M., Villata M., De Francesco G., Lanteri L., Cavallone M.,
Sobrito G.
<Astron. Astrophys. Suppl. Ser. 132, 361 (1998)>
=1998A&AS..132..361R 1998A&AS..132..361R
ADC_Keywords: BL Lac objects ; Magnitudes
Keywords: galaxies: active - BL Lacertae objects: general
Description:
Optical data in the Johnson's BV and Cousins' R bands are presented
for eight X-ray selected BL Lacertae objects that have recently been
pointed by the Satellite per Astronomia X `Beppo'(BeppoSAX). The
observations were done with the 1.05m telescope of the Torino
Astronomical Observatory and the observational periods include, or are
close to, the satellite pointings. These data provide optical
information on sources that have been rarely observed in the optical
band. Moreover, they can be compared to the X-ray ones for a better
understanding of the emission properties of these objects. Variability
on short time scales (a few days) was found for MS 0317.0+1834,
1ES 0347-121, and MS 0737.9+7441.
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
tab2-9.dat 34 144 BVR observations
mean.dat 66 20 Observations
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See also:
J/A+AS/116/403 : RI photometry of stars in 12 BL Lac objects (Fiorucci+, 1996)
J/A+AS/144/481 : BVRI photometry of five BL Lacs (Villata+, 2000)
Byte-by-byte Description of file: tab2-9.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- BLLac Source designation
10- 21 F12.4 d HJD Heliocentric Julian date
23 A1 --- Band [VRB] Band
25- 29 F5.2 mag mag Magnitude in the band Band
31- 34 F4.2 mag e_mag rms uncertainty on mag
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Byte-by-byte Description of file: mean.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- BLLac Source designation
10- 11 I2 h RAh Right ascension (J2000.0) (from table1)
13- 14 I2 min RAm Right ascension (J2000.0) (from table1)
16- 19 F4.1 s RAs Right ascension (J2000.0) (from table1)
21 A1 --- DE- Declination sign
22- 23 I2 deg DEd Declination (J2000.0) (from table1)
25- 26 I2 arcmin DEm Declination (J2000.0) (from table1)
28- 29 I2 arcsec DEs Declination (J2000.0) (from table1)
31 A1 --- Band [VRB] Band
33- 40 A8 "DD/MM/YY" Date1 Observation date (beginning)
42 A1 --- --- [-] Separation dash
44- 51 A8 "DD/MM/YY" Date2 Observation date (end)
53- 57 F5.2 mag magmin ? Minimum magnitude
59- 63 F5.2 mag magmax ? Maximum magnitude
65- 66 I2 --- Nobs [1/21] Number of observations
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Acknowledgements:
Claudia M. Raiteri <raiteri(at)to.astro.it>
History:
* 11-Aug-1998: Original version, but the HJD's in tab2-9.dat were
offset by 5000d (JD(true) = JD(table)+5000)
* 23-Jul-2015: Error on dates fixed, thanks to an annotation from
the author.
(End) C.M. Raiteri [], Patricia Bauer [CDS] 11-Aug-1998