The properties of AP Librae from UBV photoelectric photometry

Details The properties of AP Librae from UBV photoelectric photometry The properties of AP Librae from UBV photoelectric photometry

Jan 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...105..284w&link_type=abstract

Astronomy and Astrophysics, vol. 105, no. 2, Jan. 1982, p. 284-292.

Astronomy and Astrophysics

Astrophysics

9

Astronomical Photometry, Bl Lacertae Objects, Electrophotometers, Elliptical Galaxies, Quasars, Ubv Spectra, Brightness Distribution, Galactic Nuclei, Interstellar Extinction, Radiant Flux Density, Red Shift

Scientific paper

Photoelectric UBV observations of the BL Lacertae type object AP Librae have been made from March, 1975, to June, 1980. During this period variations in V between 14.32 and 15.12 mag have been observed with a diaphragm of 16". The decrease in brightness of AP Lib is accompanied by a reddening amounting to about 0.2 mag in B-V and 0.3 mag in U-B for the change in V given above.
During several nights with good to excellent seeing observations were made with a series of diaphragms ranging from 8" to 62". These measurements made it possible to identify two components in AP Lib: an extended component, possibly an E galaxy with ultraviolet excess, and a nucleus with "miniquasar" properties. The results are as follows:
a) The extended component: V0G,26 = l4.7; (B-V)0G = +0.97; (U-B)0G = +0.11; MV,26 = -22.6 with H = 5O km s-1 Mpc-1 and z = 0.0486.
The mean gradient is similar to that of an elliptical galaxy but it is possible that two components exist with the inner one corresponding to the face-on diameter D (0) =1 8".6.
b) The nucleus: Its flux varies but the colours (B-V)0G = +0.51 and (U-B)0Q = -0.61 appear constant within the accuracy of our measurements and analysis. Between 1975 and 1980 we have observed 14.6- - 17.0, and, by adding historical values, we may assume that the nucleus has occasionally reached V0Q ∼14. Its luminosity has then varied between MV,Q = -23 and -20, and it may be considered a mini-quasar.

Affiliated with

Also associated with

No associations

Rating

The properties of AP Librae from UBV photoelectric photometry does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The properties of AP Librae from UBV photoelectric photometry, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The properties of AP Librae from UBV photoelectric photometry will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1455073