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J/AJ/109/817         Photometry of WN8 Stars                    (Antokhin+ 1995)

The Enigmatic WN8 Stars: Intensive Photometry of Four Southern Stars on Time Scales From 30 min to 3 Months Antokhin I., Bertrand J.-F., Lamontagne R., Moffat A.F.J., Matthews J. <Astron. J. 109, 817 (1995)> =1995AJ....109..817A
ADC_Keywords: Stars, Wolf-Rayet; Photometry Abstract: We present the first results of an extensive photometric study of the most intrinsically variable Wolf-Rayet stars: the WN8 subclass. Some 375 individual differential observations of WR16 and WR40 were obtained over a contiguous interval of ∼3 months in a narrow visual continuum bandpass. Over the same interval, we obtained roughly 200 broadband V observations of the fainter WN8 stars WR66 and WR82. All four WN8 stars show significant random variability on time scales of hours to ∼a day -- probably related to the stochastic formation, propagation, and decay of emitting/scattering inhomogeneities in the winds. Unlike for WR66 and WR82, the photometric behaviour of WR16 and WR40 is more deterministic with ∼two possible periods in the range ∼2-30 days -- possibly related to some kind of LBV, binary, or rotation phenomenon. In addition, WR82 shows a possible secular decline during the 3 months and WR66 reveals a clear periodicity of 3.51 h. This short period may be related to nonradial pulsations or a spiral-in binary process invoking a low-mass, compact companion as seen in the massive x-ray binary Cyg X-3, a WN7 + c system of period 4.8 h. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 79 8 Comparison stars for the WN8 stars table2 33 367 Narrowband visual photometry for WR16 table3 33 381 Narrowband visual photometry for WR40 table4 33 219 Broadband visual photometry for WR66 table5 33 163 Broadband visual photometry for WR82 table.tex 69 9 LaTeX document to format tables 2, 3, 4, & 5 table2.tex 67 382 AASTeX version of Table 2 table3.tex 67 396 AASTeX version of Table 3 table4.tex 66 234 AASTeX version of Table 4 table5.tex 66 178 AASTeX version of Table 5
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 4 A4 --- WR WR number 6- 14 A9 --- Other Other name 15- 20 F6.2 mag vmag []? v magnitude 21- 25 F5.2 mag b-v []? b-v color 28- 29 A2 --- Cmp Comparison star number (C1 or C2) 31- 39 A9 --- Name Comparison star name 41- 42 A2 --- Sp Spectral type 43- 47 F5.1 mag Vmag V magnitude 48- 55 F8.4 mag WR-C Difference between comparison and WR 56- 63 F8.4 mag e_WR-C Error (sigma) in WR-C 64- 71 F8.4 mag C2-C1 ? Difference between comparison star 72- 79 F8.4 mag e_C2-C1 ? Error (sigma) in C2-C1
Byte-by-byte Description of file: table2 table3 table4 table5
Bytes Format Units Label Explanations
1- 12 F12.4 d HJD Heliocentric Julian Date 14- 19 F6.4 mag WR-C1 WR-C1 differential magnitude 21- 26 F6.4 mag WR-C2 WR-C2 differential magnitude 28- 33 F6.4 mag C2-C1 C2-C1 differential magnitude
Origin: AAS CD-ROM series, Volume 4, 1995 Lee Brotzman [ADS] 26-Apr-1995 (JD completed at CDS)
(End) [CDS] 11-Jul-1995
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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