J/ApJ/620/961 Diameters of Mira stars in JHK' bands (Millan-Gabet+, 2005)
Diameters of Mira stars measured simultaneously in the J, H, and K'
near-infrared bands.
Millan-Gabet R., Pedretti E., Monnier J.D., Schloerb F.P., Traub W.A.,
Carleton N.P., Lacasse M.G., Segransan D.
<Astrophys. J., 620, 961-969 (2005)>
=2005ApJ...620..961M 2005ApJ...620..961M
ADC_Keywords: Stars, variable ; Stars, diameters ; Photometry, infrared
Keywords: instrumentation: interferometers - stars: atmospheres -
stars: fundamental parameters - stars: variables: other -
techniques: high angular resolution
Abstract:
We present the first spatially resolved observations of a sample of 23
Mira stars simultaneously measured in the near-infrared J, H, and K'
bands. The technique used was optical long-baseline interferometry,
and we present for each star visibility amplitude measurements as a
function of wavelength. We also present characteristic sizes at each
spectral band, obtained by fitting the measured visibilities to a
simple uniform disk model. This approach reveals the general relation
J diameter < H diameter < K' diameter.
Description:
Observations were carried out at the Infrared Optical Telescope Array
(IOTA), a long-baseline interferometer located on Mount Hopkins, AZ.
The data presented here were obtained using the two telescopes
available at the time on two configurations that provide physical
baseline lengths of approximately 21 and 38m at geographic azimuth
angles (measured east of north) of -4° and +18°, respectively.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 69 23 Basic properties of Mira star sample
table2.dat 58 34 Log of observations
table4.dat 54 259 Calibrated visibility data
table5.dat 81 35 Near-infrared angular diameters and diameter ratios
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See also:
J/A+A/384/925 : Compiled catalog of stellar data of Miras (Kharchenko+, 2002)
J/A+AS/120/275 : Mira variables light curves (Alard+ 1996)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Name Star name
8- 9 I2 h RAh Hour of Right Ascension (J2000.0)
11- 12 I2 min RAm Minute of Right Ascension (J2000.0)
14- 18 F5.2 s RAs Second of Right Ascension (J2000.0)
20 A1 --- DE- Sign of the Declination (J2000.0)
21- 22 I2 deg DEd Degree of Declination (J2000.0)
24- 25 I2 arcmin DEm Arcminute of Declination (J2000.0)
27- 30 F4.1 arcsec DEs Arcsecond of Declination (J2000.0)
32- 35 F4.1 mag Vmag1 Minimum of V band magnitude (1)
37 A1 --- --- [-]
39- 40 I2 mag Vmag2 Maximum of V band magnitude (1)
42- 45 F4.1 mag Jmag ? J band magnitude (2)
47- 51 F5.2 mag Hmag ? H band magnitude (2)
53- 56 F4.1 mag K'mag ? K' band magnitude (2)
58- 59 A2 --- SpType MK spectral type (1)
61- 63 I3 pc Dist ? Distance
65- 67 I3 pc e_Dist ? Error in Dist
69 I1 --- r_Dist ? Distance reference (3)
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Note (1): V magnitudes and spectral types are from the AAVSO and SIMBAD
databases.
Note (2): Near-infrared magnitudes are from the 2MASS database.
Note (3): Distance reference, defined as follows:
1 = Van Belle et al. (1997AJ....114.2150V 1997AJ....114.2150V)
2 = Jura & Kleinmann (1992ApJS...79..105J 1992ApJS...79..105J)
3 = van Belle et al. (2002AJ....124.1706V 2002AJ....124.1706V)
4 = Wyatt & Cahn (1983ApJ...275..225W 1983ApJ...275..225W)
5 = Young (1995ApJ...445..872Y 1995ApJ...445..872Y)
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Name Star name
8- 17 A10 "YYYY/MM/DD" ObsDate Date of observation
19- 27 F9.1 d JD Julian date of observation
29- 34 A6 --- Baseline Baseline (1)
36- 42 A7 --- Filt Filters
43- 58 A16 --- Cal Calibrators
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Note (1): SxNy refers to the south telescope being at the x meter station
and the north telescope at the y meter station. The (length, azimuth)
values of the S15N15 and S15N35 baselines are (21m, -3.8°) and
(38m, +18°), respectively.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Name Star name
8- 17 A10 "YYYY/MM/DD" ObsDate Date of the observation
19- 25 I7 d JD Julian Date of the observation
27- 28 A2 --- Filt Spectral band
30- 35 F6.2 arcsec-1 u The u spatial frequency
37- 42 F6.2 arcsec-1 v The v spatial frequency
44- 48 F5.3 mag Vamp Calibrated visibility amplitude
50- 54 F5.3 mag e_Vamp Error in VAmp
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Name Star name
8- 16 F9.1 d JD ? Julian date of observation
18- 21 F4.2 --- Phase ? Pulsation phase
23- 25 F3.1 --- Mtype ? Phased Spectral Type (M subclass)
27 A1 --- l_DJ Limit flag on DJ
28- 31 F4.1 mas DJ ? J band uniform disk diameter
33- 36 F4.1 mas e_DJ ? Error in DJ
38 A1 --- l_DH Limit flag on DH
39- 43 F5.2 mas DH ? H band uniform disk diameter
45- 49 F5.2 mas e_DH ? Error in DH
51 A1 --- l_DK' Limit flag on DK'
52- 56 F5.2 mas DK' ? K' band uniform disk diameter
58- 61 F4.2 mas e_DK' ? Error in DK'
63- 66 F4.2 --- DJ/DH ? DJ/DH diameter ratio
68- 71 F4.2 --- e_DJ/DH ? Error in DJ/DH
73- 76 F4.2 --- DH/DK' ? DH/DK' diameter ratio
78- 81 F4.2 --- e_DH/DK' ? Error in DH/DK'
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 08-Feb-2006