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J/AJ/106/66 NGC 1560 BVRI CCD photometry (Lee+ 1993)
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BVRI CCD photometry of the resolved galaxy NGC 1560
Lee M.G., Madore B.F
<Astron. J. 106, 66 (1993)>
=1993AJ....106...66L (SIMBAD/NED BibCode)
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ADC_Keywords: Photometry, UBVRI ; Galaxies, photometry
Abstract:
We present BVRI CCD photometry of ~600 stars in the central region of
a resolved spiral galaxy NGC 1560 which is seen almost edge-on,
apparently located in the IC 342 group. The V-(B-V) diagram shows a
dominant group of significantly reddened blue plume stars consisting
of young massive main-sequence and evolved blue supergiant stars. The
tip of the blue plume is found to be at V~21 mag and (B-V)~0.4mag.
The I-(R-I) diagram shows a large group of red supergiants the
brightest of which are extending to I~19.5mag at (R-I)~1.1mag. The
logarithmic slope of the V luminosity function of the blue plume stars
is 0.69+/-0.10, similar to that for other nearby galaxies. The mean
color of the blue plume stars is <(B-V)>=0.25+/-0.03mag. The total
reddening, including both foreground and internal reddening, is
estimated from the mean color of the blue plume stars, to be
E(B-V)=0.40+/-0.10mag, whereas the foreground reddening based on the
H I column density and faint galaxy counts is E(B-V)=0.16mag.
Combining our results with those in the literature, we have obtained
distance estimates using four methods: brightest blue stars
[(m-M)_0_=27.11mag], brightest red stars [(m-M)_0_=27.02mag], B-band
Tully-Fisher relation [(m-M)_0_=26.96mag], and H-band Tully-Fisher
relation [(m-M)_0_=26.86mag]. These four estimates agree very well.
Taking the average of these four estimates, we obtain a value for the
true distance modulus to NGC 1560, (m-M)_0_=27.0+/-0.1mag,
corresponding to a distance of 2.5+/-0.1Mpc.
Objects:
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RA (2000) DE Designation(s)
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04 32 50 +71 52 52 NGC 1560
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2 48 607 BVRI CCD photometry of stars in NGC 1560
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Byte-by-byte Description of file: table2
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Bytes Format Units Label Explanations
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1- 3 I3 --- No Star number
5- 9 F5.1 pix Xpos X position
11- 16 F6.1 pix Ypos Y position
18- 22 F5.2 mag Vmag V magnitude
24- 28 F5.2 mag B-V ? B-V colour index
30- 34 F5.2 mag V-R ? V-R colour index
36- 40 F5.2 mag V-I ? V-I colour index
42- 46 F5.2 mag Imag ? I magnitude
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Table 5: Characteristics of NGC 1560.
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Parameter Information Reference
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alpha 1950 04h 27m 08.2s RC3
delta 1950 +71deg 46' 29" RC3
l,b 138.37, +16.02 RC3
Morphological class Sd RC3
Holmberg diameter 118.9 x 2t.2 Broeils 1992
Inclination angle 82+/-1 deg Broeils 1992
HI line width W20 157+/-5 km/s Lewis & Davies (1973)
log W^iR 2.103 RC3, This study
Total reddening E(B-V) 0.4 mag This study
Foreground reddening E(B-V) 0.16 mag Burstein & Heiles (1982)
BT, M^TB 12 16,-16.67 mag RC3, This study
VT,M^VT 11.44,-16.90 mag RC3, This study
H-0.5,MH 9.22,-17.90 mag Tully 1988, This study
<B(3)>(BSG) 20.26 mag K1991, This study
<V(3)>(RSG) 20.54 mag kl991, This study
(m-M)B 28.83 mag This study
(m-M)V 28.34 mag This study
(m-m)0 27.0+/-0.1 mag This study
Distance 2.5+/-0.1 Mpc This study
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References: Broeils 1992A&A...256...19B
Lewis & Davies 1973MNRAS.165..213L
Burstein & Heiles 1982AJ.....87.1165B
Tully 1988, Nearby Galaxies Catalogue, Cat. <VII/145>
K1991, Karachentsev et al., 1991A&AS...91..503K
RC3, Cat. <VII/155>
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History: Prepared via OCR at CDS.
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(End) James Marcout, Patricia Bauer [CDS] 18-Mar-1997