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J/AJ/106/66         NGC 1560 BVRI CCD photometry (Lee+ 1993)

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)
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: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 04 32 50 +71 52 52 NGC 1560 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2 48 607 BVRI CCD photometry of stars in NGC 1560
Byte-by-byte Description of file: table2
Bytes Format Units Label Explanations
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
Table 5: Characteristics of NGC 1560. ------------------------------------------------------------------------------- Parameter Information Reference ------------------------------------------------------------------------------- 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 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 History: Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 18-Mar-1997
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