J/A+AS/120/267 T Tauri stars UBrHalphaz photometry (Osterloh+ 1996)
Detection of periods for T Tauri stars
Osterloh M., Thommes E., Kania U.
<Astron. Astrophys. Suppl. Ser. 120, 267 (1996)>
=1996A&AS..120..267O 1996A&AS..120..267O (SIMBAD/NED BibCode)
ADC_Keywords: Stars, pre-main sequence ; Photometry
Keywords: stars: evolution - stars: pre-main sequence - stars: rotation
Abstract:
We present the results of UBrHαz monitoring of a sample of
T Tauri stars. The method of differential CCD photometry was applied.
The observations span a range of ten days and show that eleven out of
twelve sources varied during this time interval. These variations are
correlated in all bands. Periods were detected (confidence level
99.99%) for eight out of eleven variable stars; one additional period
was found at the 99.9% confidence level. Of those, one (BP Tau) agrees
with previously published periods; two, GM Aur and IQ Tau, do not; six
are new detections of periodicities. The sample is drawn from the
Taurus-Auriga and Cepheus IV star-forming regions.
Central wavelengths and FWHM of the filters used:
--------------------
Filter (nm) (nm)
--------------------
U 370 46
B 457 96
r 663 108
z 910 90
Halpha 655.4 16.3
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Objects:
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RA (2000) DE Designation(s)
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04 55 11 +30 22.0 GM Aur
04 23 39.1 +24 56 15 FT Tau
04 29 58 +26 07.2 IQ Tau
04 51 48 +30 47.2 UY Aur
04 47 48 +29 25.3 DS Tau
04 38 28.5 +26 10 50 DO Tau
04 19 14 +29 07.1 BP Tau
00 42.2 +62 05 LkHa 200
00 13 29.1 +65 35 59 MacC H9
23 54 52.1 +66 57 37 MacC sH1
00 12 54.4 +65 34 08 MacC H10
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table 73 1206 UBrHalphaz photometry (Appendix)
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Byte-by-byte Description of file: table
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Strar name
11- 16 F6.4 d JD-2449676 Julian Date-2449676.0
18- 22 F5.2 mag Umag ? magnitude difference in U (1)
24- 27 F4.2 mag e_Umag ? rms uncertainty on Umag
29- 33 F5.2 mag Bmag ? magnitude difference in B (1)
35- 38 F4.2 mag e_Bmag ? rms uncertainty on Bmag
41- 45 F5.2 mag rmag ? magnitude difference in r (1)
47- 50 F4.2 mag e_rmag ? rms uncertainty on rmag
52- 56 F5.2 mag Ha ? magnitude difference in Halpha (1)
58- 61 F4.2 mag e_Ha ? rms uncertainty on Halpha
63- 67 F5.2 mag zmag ? magnitude difference in z (1)
69- 72 F4.2 mag e_zmag ? rms uncertainty on zmag
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Note (1): The magnitude difference represent the photometric changes relative
to the median value, indicated in the following table.
Median absolute brightness
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Name U B r z
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GM Aur 13.20 12.87 10.74 9.89
FT Tau 15.01 15.30 12.90 11.15
IQ Tau 14.72 14.45 11.88 10.39
UY Aur 14.39 14.28 11.80 10.35
DS Tau 12.97 13.15 11.35 10.18
DO Tau 13.76 14.26 12.00 10.32
BP Tau 12.97 13.04 10.81 9.75
LkHa 200 15.27 14.67 12.57 11.61
MacC H9 16.64 16.01 13.67 12.46
MacC sH15 16.02 15.21 12.80 11.41
MacC H10 16.50 15.72 13.30 12.11
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Acknowledgements: Martin Osterloh
(End) Patricia Bauer [CDS] 29-Apr-1996