J/AJ/99/784 IR photometry of LMC long-period variables (Hughes+ 1990)
Long-period variables in the Large Magellanic Cloud. II. Infrared photometry,
spectral classification, AGB evolution, and spatial distribution.
Hughes S.M.G., Wood P.R.
<Astron. J. 99, 784 (1990)>
=1990AJ.....99..784H 1990AJ.....99..784H (SIMBAD/NED BibCode)
ADC_Keywords: Magellanic Clouds ; Stars, variable ; Photometry, infrared ;
MK spectral classification
Abstract:
Infrared JHK photometry and visual spectra have been obtained for a
large sample of long-period variables (LPVs) in the Large Magellanic
Cloud (LMC). Various aspects of the asymptotic giant branch (AGB)
evolution of LPVs are discussed using these data. The birth/death rate
of LPVs of different ages in the LMC is compared with the birth rates
of appropriate samples of planetary nebulae clump stars, Cepheids, and
OH/IR stars. It appears that there are much fewer large-amplitude LPVs
per unit galactic stellar mass in the LMC than in the Galaxy. We
suggest that this may be due to the fact that the evolved
intermediate-age AGB stars in the LMC often turn into carbon stars,
which tend to have smaller pulsation amplitudes than M stars. There is
also a major discrepancy between the number of LPVs in the LMC (and in
the Galaxy) and the number predicted by the theories of AGB evolution,
pulsation, and mass loss. A distance modulus to the LMC of 18.66+0.05
is derived by comparing the LMC LPVs with P∼200days with the 47
Tucanae Mira variables in the (K, logP) plane. The (K, logP) relation
is also used to examine the tilt of the LMC populations of old and
intermediate-age stars.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2 91 376 JHK photometry of large-amplitude LPVs
table3 91 224 JHK photometry of small-amplitude LPVws
table4 92 15 JHK photometry of old variables
table5 116 29 LPV - IRAS proximity matches
table6 48 14 LPVs excluded from (K, log P) fit
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2 table3 table4
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 17 A17 --- Name LPV name/position (1)
18 A1 --- n_Name [abc] Note on name (2)
20- 23 F4.2 mag DImag Peak to peak I amplitude
25- 31 I7 d JDImax Julian date of a recent I maximum
33- 37 F5.2 mag Imag Mean I magnitude
39- 43 F5.2 mag Jmag J magnitude
44 A1 --- u_Jmag Uncertainty flag on Jmag (0.05≤e_Jmag≤0.13)
46- 50 F5.2 mag Hmag H magnitude
51 A1 --- u_Hmag Uncertainty flag on Hmag (0.05≤e_Hmag≤0.13)
53- 57 F5.2 mag Kmag K magnitude
58 A1 --- u_Kmag Uncertainty flag on Kmag (0.05≤e_Kmag≤0.13)
60- 65 F6.2 mag Mbol Bolometric magnitude derived from K and J-K
67- 70 A4 --- SpType Spectral type obtained by spectroscopy,
or, if enclosed in parentheses, from J-K
72- 78 I7 d JD Julian date at which the photometry was obtained
80- 83 I4 d Per ? Period of the variable
84- 85 A2 --- u_Per [: ] Marginal periodic variables
87- 90 I4 d Per2 ? Second period (3)
91- 92 A2 --- u_Per2 [: ] Marginal periodic variables
--------------------------------------------------------------------------------
Note (1): SHV refers to the variables found in Hughes (1989AJ.....97.1634H 1989AJ.....97.1634H)
RHV refers to the variables found in Reid et al. (1988MNRAS.232...53R 1988MNRAS.232...53R)
raw photometry data using the methods of paper I (Hughes,
1989AJ.....97.1634H 1989AJ.....97.1634H) that were not found by
Reid et al. (1988MNRAS.232...53R 1988MNRAS.232...53R).
Note (2): a : Merged (double) image
b : Near a bright star
c : Near a cluster
Note (3): Occasionally, a second period gave a convincing light curve and this
second period has also been included, with the period giving the more
believable light curve in column Per
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 17 A17 --- Name LPV name/position (1)
19- 21 I3 d Per Period of the variable
22- 23 A2 --- u_Per [: ] Uncertainty flag on Per
25- 29 A5 --- SpType Spectral type (2)
31- 34 F4.2 mag DImag ? Peak to peak I amplitude (2)
36- 40 F5.2 mag Imag ? I magnitude (2)
42- 46 F5.2 mag Jmag ? J magnitude (2)
48- 52 F5.2 mag Hmag ? H magnitude (2)
54- 58 F5.2 mag Kmag ? K magnitude (2)
60- 73 A14 --- IRAS IRAS name
75 A1 --- l_F12 Limit flag on F12
76- 80 F5.2 mJy F12 12µm flux density
81 A1 --- u_F12 Uncertainty flag on F12
83 A1 --- l_F25 Limit flag on F25
84- 88 F5.2 mJy F25 25µm flux density
89 A1 --- u_F25 Uncertainty flag on F25
91 A1 --- l_F60 Limit flag on F60
92- 97 F6.2 mJy F60 ? 60µm flux density
98 A1 --- u_F60 Uncertainty flag on F60
100 A1 --- l_F100 Limit flag on F100
101-106 F6.2 mJy F100 ? 100µm flux density
107 A1 --- u_F100 Uncertainty flag on F100
109-111 I3 arcsec Xoffset Offset on X position
114-116 I3 arcsec Yoffset Offset on Y position
--------------------------------------------------------------------------------
Note (1): SHV refers to the variables found in Hughes (1989AJ.....97.1634H 1989AJ.....97.1634H)
GRV refers to the variables in Reid et al., (1988MNRAS.232...53R 1988MNRAS.232...53R)
RHV refers to the variables found in Reid et al. (1988MNRAS.232...53R 1988MNRAS.232...53R)
raw photometry data using the methods of paper I,
(Hughes, 1989AJ.....97.1634H 1989AJ.....97.1634H), that were not found by
Reid et al. (1988MNRAS.232...53R 1988MNRAS.232...53R).
HV refers to Harvard variables, Hodge & Wright, 1967,
Smithsonian Inst. Astrophys. Obs. No. 4699
Note (2): Spectral types and JHK photometry of Harvard variables (HV) from
Wood et al. (1983ApJ...272...99W 1983ApJ...272...99W), and their I and {DELTA}I from
Reid et al. (1988MNRAS.232...53R 1988MNRAS.232...53R).
Photometry of GRV stars from Reid et al. (1988MNRAS.232...53R 1988MNRAS.232...53R).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table6
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 17 A17 --- Name LPV name/position (1)
19- 21 I3 d Per Period of the variable
23- 27 F5.2 mag Imag Mean I magnitude
29- 32 F4.2 mag DImag Peak to peak I amplitude
34- 37 F4.2 mag J-H J-H colour index
39- 42 F4.2 mag H-K H-K colour index
44- 48 F5.2 mag Kmag K magnitude
--------------------------------------------------------------------------------
Note (1): SHV refers to the variables found in Hughes (1989AJ.....97.1634H 1989AJ.....97.1634H)
--------------------------------------------------------------------------------
Table VII. LPV bar density distribution.
--------------------------------------------------------------------------------
Period N ρ0 A B θ0 X0 Y0
Group N/deg2 deg deg deg deg deg
--------------------------------------------------------------------------------
100- 225 207 8.8±0.8 4.6±0.9 1.3±0.1 117± 3 0.0±0.1 0.0± 0.1
225- 450 347 10.8±0.6 3.6±0.3 2.2±0.1 112± 5 0.0±0.1 -0.02±0.02
450-1000 38 2.0±0.4 6.0±5.7 3.1±1.2 134±40 0.3±0.7 -0.3 ±1.0
--------------------------------------------------------------------------------
History: Prepared via OCR at CDS.
References:
Hughes, Paper I., 1989AJ.....97.1634H 1989AJ.....97.1634H
(End) James Marcout, Patricia Bauer [CDS] 16-May-1997