J/A+A/385/793 Cepheids in Magellanic Clouds. II. (Antonello+, 2002)
Search for second overtone mode Cepheids in Magellanic Clouds.
II. Characteristics of second overtone mode pulsations.
Antonello E., Fugazza D., Mantegazza L.
<Astron. Astrophys. 385, 793 (2002)>
=2002A&A...385..793A 2002A&A...385..793A
ADC_Keywords: Magellanic Clouds ; Stars, variable ; Photometry, CCD
Keywords: stars: oscillations - stars: variables: Cepheids -
galaxies: Magellanic Cloud
Abstract:
The analysis of CCD observations of ten new suspected second overtone
mode Cepheids in the SMC does not confirm the nature of such stars;
most of them appear to be first overtone mode Cepheids. A careful
analysis of the OGLE best second overtone mode candidates and of the
second overtone component of double mode Cepheids in SMC and LMC has
been performed in order to clarify the possible effects of a resonance
between pulsation modes. There are some indications that such a
resonance is indeed operating in these pulsators. A brief discussion
of the effects of blending on the light curve shape is also reported,
and the usefulness of the Fourier parameters as mode discriminators is
discussed.
The observations were performed with the direct CCD camera at the
Dutch 0.91m telescope of La Silla (ESO) during three runs in November
1997 (6 nights), July 1998 (12 nights) and October 1998 (15 nights).
The CCD detector was the ESO chip No. 33, which is a TEK CCD with
512x512 pixels, pixel size of 27µm and spatial resolution of 0.44",
providing a small field of view of 3.77'x3.77'. 8 fields were selected
in order to observe the ten second overtone candidates.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table3.dat 79 59 F, 1O, and DM Cepheids
table4.dat 79 10 Cepheids (continued)
table5.dat 79 10 EROS 2O mode candidates
--------------------------------------------------------------------------------
See also:
J/A+A/303/137 : EROS Variables: Cepheids in the LMC bar (Beaulieu+ 1995)
J/A+A/333/L35 : MC Cepheids Fourier decomposition (Antonello 1998)
J/ApJS/117/135 : Photometry of Cepheids in MC (Moffett+ 1998)
J/PASP/111/812 : V(RI)C Phot of Cepheids in MC (Barnes+ 1999)
J/AcA/49/223 : BVI photometry of OGLE LMC Cepheids (Udalski+, 1999)
J/AcA/49/437 : BVI photometry of OGLE SMC Cepheids (Udalski+, 1999)
J/AcA/49/543 : OGLE LMC + SMC Cepheids VI photometry (Pietrzynski+, 1999)
Byte-by-byte Description of file: table3.dat table4.dat table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- [AFM2002] Name (FFa-NNNN)
10 I1 h RAh Right ascension (J2000)
12- 13 I2 min RAm Right ascension (J2000)
15- 19 F5.2 s RAs Right ascension (J2000)
21 A1 --- DE- Declination sign (J2000)
22- 23 I2 deg DEd Declination (J2000)
25- 26 I2 arcmin DEm Declination (J2000)
28- 31 F4.1 arcsec DEs Declination (J2000)
33- 37 F5.2 mag Vmag V magnitude
38 A1 --- u_Vmag [?] Uncertainty flag on Vmag
40- 44 F5.2 mag Imag ? I magnitude
46- 51 F6.3 d Per Period
53- 60 A8 --- Mode Pulsation mode (1)
62- 69 A8 --- EROS EROS designation
71- 79 A9 --- OGLE OGLE designation
--------------------------------------------------------------------------------
Note (1): Pulsation mode:
DMC: double-mode Cepheids
2O: second overtone mode Cepheid
1O: first overtone mode Cepheid
F: fundamental mode Cepheid
--------------------------------------------------------------------------------
History:
From electronic version of the journal
References:
Mantegazza & Antonello, Paper I 1998A&AS..132...39M 1998A&AS..132...39M
(End) James Marcout, Patricia Bauer [CDS] 13-May-2002