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J/PAZh/37/691       V340 Ser and V448 Lac light curves       (Arkhipova+, 2011)

Photometric variability of five candidates for protoplanetary nebulae. Arkhipova V.P., Ikonnikova N.P., Komissarova G.V. <Pis'ma Astron. Zh. 37, 691 (2011)> =2011PAZh...37..691A =2011AstL...37..635A
ADC_Keywords: Stars, variable ; Stars, supergiant ; Photometry, UBV Keywords: post-AGB supergiants - photometric observations - variable stars - protoplanetary nebulae Abstract: We analyze long-term UBV observations and ASAS-3 photometry for five candidates for protoplanetary nebulae - F and G supergiants with infrared excesses at high Galactic latitudes - V340 Ser, IRAS 05113+1347, V552 Pup, V448 Lac, and RV Col. These stars exhibit quasi-periodic multifrequency light variations caused by pulsations with characteristic time scales from 83 to 139 days, depending on the stellar temperature. Cooler stars undergo variations with larger amplitudes and periods. The variations at close frequencies with a period ratio of 1.03-1.09 are responsible for the amplitude modulation revealed for most program stars. Description: We performed our UBV observations of two program stars, V340 Ser and V448 Lac, at the Crimean Station of the Sternberg Astronomical Institute using a 60-cm Zeiss reflector with a photoelectric photometer designed by Lyuty (1971, Soobshch. GAISh 172, 30) with a 27 aperture. The accuracy of the observations was from 0.01mag to 0.02mag. The photometric system of the photometer is close to Johnson's standard UBV system. Objects: --------------------------------------------------------------------- RA (2000) DE Designation(s) (files) --------------------------------------------------------------------- 17 30 46.9 -11 22 08 V340 Ser = ASAS J173047-1122.1 (table3) 22 24 31.4 +43 43 11 V448 Lac = BD+42 4388 (table4) --------------------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 25 104 UBV observations of V340 Ser in 2003-2010 table4.dat 25 134 UBV observations of V448 Lac in 2003-2010
Byte-by-byte Description of file: table3.dat table4.dat
Bytes Format Units Label Explanations
1- 7 I7 d HJD Heliocentric Julian date 9- 13 F5.3 mag Vmag Johnson V magnitude 15- 19 F5.3 mag B-V Johnson B-V colour index 21- 25 F5.3 mag U-B Johnson U-B colour index
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 29-Sep-2011
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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