J/A+A/535/A3 SuperWASP observations of pulsating Am stars (Smalley+, 2011)
SuperWASP observations of pulsating Am stars.
Smalley B., Kurtz D.W., Smith A.M.S., Fossati L., Anderson D.R.,
Barros S.C.C., Butters O.W., Collier Cameron A., Christian D.J., Enoch B.,
Faedi F., Haswell C.A., Hellier C., Holmes S., Horne K., Kane S.R.,
Lister T.A., Maxted P.F.L., Norton A.J., Parley N., Pollacco D.L.,
Simpson E.K., Skillen I., Southworth J., Street R.A., West R.G.,
Wheatley P.J., Wood P.L.
<Astron. Astrophys. 535, A3 (2011)>
=2011A&A...535A...3S 2011A&A...535A...3S
ADC_Keywords: Stars, Am ; Stars, variable ; Photometry, CCD
Keywords: asteroseismology - stars: chemically peculiar - stars: oscillations -
stars: variables: delta Scuti - techniques: photometry
Abstract:
We have studied over 1600 Am stars at a photometric precision of 1mmag
with SuperWASP photometric data. Contrary to previous belief, we find
that around 200 Am stars are pulsating delta Sct and gamma Dor stars,
with low amplitudes that have been missed in previous, less extensive
studies. While the amplitudes are generally low, the presence of
pulsation in Am stars places a strong constraint on atmospheric
convection, and may require the pulsation to be laminar. While some
pulsating Am stars have been previously found to be delta Sct stars,
the vast majority of Am stars known to pulsate are presented in this
paper. They will form the basis of future statistical studies of
pulsation in the presence of atomic diffusion.
Description:
File table1 contains details of the pulsating Am stars observed with
SuperWASP, including the full set of identified frequencies and
amplitudes.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 348 227 Pulsating Am stars observed
--------------------------------------------------------------------------------
See also:
III/260 : General Catalogue of Ap and Am stars (Renson+ 2009)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 A6 --- --- [1SWASP]
7- 25 A19 --- SWASP SuperWASP Identifier (JHHMMSS.ss+DDMMSS.s)
27- 31 I5 --- Renson Star number in Renson et al., Cat. III/260
33- 47 A15 --- Name Name
49- 64 A16 --- SpType MK spectral Type
66- 70 F5.3 [K] logTeff ? Effective Temperature
72- 76 F5.3 [Lsun] logL ? Luminosity of star
78 A1 --- Met [a-d] Method used to determine stellar
parameters (1)
80- 88 A9 --- Class Pulsation class (2)
90- 93 I4 d DeltaT Time baseline of SuperWASP photometry
95- 96 I2 --- nFreq [1/18] Number of identified frequencies
98-104 F7.4 d-1 Freq1 Frequency 1
106-110 F5.2 mmag Amp1 Amplitude 1
112-118 F7.4 d-1 Freq2 ? Frequency 2
120-124 F5.2 mmag Amp2 ? Amplitude 2
126-132 F7.4 d-1 Freq3 ? Frequency 3
134-138 F5.2 mmag Amp3 ? Amplitude 3
140-146 F7.4 d-1 Freq4 ? Frequency 4
148-152 F5.2 mmag Amp4 ? Amplitude 4
154-160 F7.4 d-1 Freq5 ? Frequency 5
162-166 F5.2 mmag Amp5 ? Amplitude 5
168-174 F7.4 d-1 Freq6 ? Frequency 6
176-180 F5.2 mmag Amp6 ? Amplitude 6
182-188 F7.4 d-1 Freq7 ? Frequency 7
190-194 F5.2 mmag Amp7 ? Amplitude 7
196-202 F7.4 d-1 Freq8 ? Frequency 8
204-208 F5.2 mmag Amp8 ? Amplitude 8
210-216 F7.4 d-1 Freq9 ? Frequency 9
218-222 F5.2 mmag Amp9 ? Amplitude 9
224-230 F7.4 d-1 Freq10 ? Frequency 10
232-236 F5.2 mmag Amp10 ? Amplitude 10
238-244 F7.4 d-1 Freq11 ? Frequency 11
246-250 F5.2 mmag Amp11 ? Amplitude 11
252-258 F7.4 d-1 Freq12 ? Frequency 12
260-264 F5.2 mmag Amp12 ? Amplitude 12
266-272 F7.4 d-1 Freq13 ? Frequency 13
274-278 F5.2 mmag Amp13 ? Amplitude 13
280-286 F7.4 d-1 Freq14 ? Frequency 14
288-292 F5.2 mmag Amp14 ? Amplitude 14
294-300 F7.4 d-1 Freq15 ? Frequency 15
302-306 F5.2 mmag Amp15 ? Amplitude 15
308-314 F7.4 d-1 Freq16 ? Frequency 16
316-320 F5.2 mmag Amp16 ? Amplitude 16
322-328 F7.4 d-1 Freq17 ? Frequency 17
330-334 F5.2 mmag Amp17 ? Amplitude 17
336-342 F7.4 d-1 Freq18 ? Frequency 18
344-348 F5.2 mmag Amp18 ? Amplitude 18
--------------------------------------------------------------------------------
Note (1): Method of stellar parameter determination as follows:
a = uvbyβ photometry
b = uvby photometry
c = Geneva photometry
d = spectral energy distribution and parallax
Note (2): pulsation classes are
* DSCT (δ Sct) stars (frequencies > 5d-1)
* GDOR (γ Dor) stars (frequencies < 5d-1)
* DSCT+GDOR hybrid: most frequencies above 5d-1,
but some low frequencies are present.
* GDOR+DSCT hybrid: most frequencies below 5d-1,
but some high frequencies are present.
--------------------------------------------------------------------------------
Acknowledgements:
Barry Smalley, bs(at)astro.keele.ac.uk
(End) Patricia Vannier [CDS] 01-Jul-2011