2007PASP..119..477Z

Query : 2007PASP..119..477Z

2007PASP..119..477Z - Publ. Astron. Soc. Pac., 119, 477-482 (2007/May-0)

Optical spectra of four BL Lacertae objects.

ZHENG Y.G., ZHANG X. and BI X.W.

Abstract (from CDS):

Many quasi-simultaneous optical observations of four BL Lac objects were obtained at the Yunnan and Shanghai Observatories. In this paper, data for the optical spectral index of four BL Lac objects are presented. Our results show that the optical spectral index of these BL Lac objects is characterized by variability. The optical spectra of the BL Lac objects H0323+022 and ON 231 flatten when the sources brighten, whereas they steepen for the objects S5 0716+71 and OJ 287.

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Journal keyword(s): Quasars and Active Galactic Nuclei

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 3C 66A BLL 02 22 39.6114771888 +43 02 07.799534304   15.71 15.21 14.5   ~ 942 2
2 PMN J0326+0225 BLL 03 26 13.9481827296 +02 25 14.675937708   17.05 16.55 15.3   ~ 255 1
3 8C 0716+714 BLL 07 21 53.4482942664 +71 20 36.363846516   15.5 15.50 14.27   ~ 1388 1
4 PG 0851+202 BLL 08 54 48.8749846272 +20 06 30.639583620   15.649 15.146 15.446   ~ 2513 1
5 7C 1219+2830 BLL 12 21 31.6904439888 +28 13 58.500308172   16.81 16.11 14.24   ~ 924 1

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