Access to Astronomical Catalogues

← Click to display the menu
J/PAZh/35/199       V,pg light curves of NSV 9159            (Berdnikov+, 2009)

Search for evolutionary changes in Cepheid periods using the Harvard plate collection: NSV 9159. Berdnikov L.N., Pastukhova E.N., Turner D.G., Majaess D.J. <Pis'ma Astron. Zh. 35, 199 (2009)> =2009PAZh...35..199B =2009AstL...35..175B
ADC_Keywords: Stars, variable ; Photometry Keywords: Cepheids - period variability - stellar evolution Abstract: We have obtained 530 photographic magnitude estimates for the long-period classical Cepheid NSV 9159 (P=39d) in the plate collections of the Harvard Observatory and the Sternberg Astronomical Institute. Together with the currently available CCD observations from the ASAS-3 catalog, our data have allowed us to construct an O-C diagram spanning a time interval of 119 years. The O-C diagram has the shape of a parabola, which has made it possible to determine for the first time the quadratic light elements and to calculate the rate of evolutionary decrease in the period, 314.4(±7.3)s/yr, in agreement with the results of theoretical calculations for the second crossing of the instability strip. The available data reduced by the Eddington-Plakidis method do not reveal any noticeable random fluctuations in the period. Description: The oldest plate with NSV 9159 was taken at the Harvard Observatory in 1889 and the latest CCD image was obtained in 2008. Consequently, our data span a time span of 119 years. Objects: ------------------------------------------------ RA (2000) DE Designation(s) ------------------------------------------------ 17 33 57.1 -20 30 23 NSV 9159 = SV* P 4349 ------------------------------------------------ File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 65 45 Times of maximum light for NSV 9159 table3.dat 19 200 Standard V and PG light curves for NSV 9159
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 9 F9.1 d JDmax Heliocentric Julian date of maximum 11- 13 F3.1 d e_JDmax rms uncertainty on JD 15- 16 A2 --- Filt [V PG] Filter 18- 21 I4 --- E Epoch number (1) 23- 27 F5.1 d O-C O-C residuals 29- 30 I2 --- N Number of observations 32- 65 A34 --- Ref Data source
Note (1): maxJDhel = 2433738.77(±0.67) + 38.87484(±0.00137)E - 0.19367x10-3(±0.44928x10-5)E2
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 5 F5.3 --- Phase [0/1] Phase 7- 12 F6.3 mag Vmag V magnitude 14- 19 F6.3 mag pgmag Photographic magnitude
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 02-Apr-2009
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

catalogue service