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J/AJ/113/401                   UBV light curves of V417 Aql (Samec+ 1997)
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U,B,V Light Curves of the Short-Period Solar-Type Eclipsing Binary, V417 Aquilae
     Samec R.G., Pauley B.R., Carrigan B.J.
    <Astron. J. 113, 401 (1997)>
    =1997AJ....113..401S
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ADC_Keywords: Binaries, eclipsing ; Photometry, UBV

Abstract:
    A complete photometric analysis of U,B,V photometry for the
    short-period solar-type V417 Aquilae is presented. Seven epochs of
    minimum light were determined from our observations covering two
    primary and five secondary eclipses. A period study covering some
    58,000 orbital cycles reveals two distinct eras of constant period
    connected by what may be a smooth transition. The periods determined
    for the two eras are nearly the same, differing by ~0.16s. During the
    intervening 23 years, a 0.1d jump in residuals takes place. The light
    curves show that V417 Aql is a W-type W UMa system with a 25min time
    of constant light in the primary minimum. The light curves are fairly
    symmetrical. A simultaneous three-color solution was computed using
    the Wilson synthetic light-curve code. Our photometry in conjunction
    with the solution reveal that V417 Aql consists of G0 V and F9 V
    spectral type components in contact with a 19% fill-out and a mass
    ratio of 0.37. Its nearly equal eclipse depths, the low mass ratio,
    and the moderate fill-out suggest that V417 Aql may be evolving into
    an A-type W UMa binary.
    (Copyright) 1997 American Astronomical Society.

Objects:
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       RA   (2000)   DE      Designation(s)
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    19 35 24.0   +05 50 19   V417 Aql
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File Summary:
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 FileName    Lrecl    Records   Explanations
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ReadMe          80          .   This file
table1          20       2542   UBV-band observations of V417 Aql
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Byte-by-byte Description of file: table1
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   Bytes Format  Units   Label      Explanations
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   1- 11  F11.3  d       HJD        Heliocentric Julian Date
      13  A1     ---     Band       [UBV] Band
  15- 20  F6.3   mag     dmag       Delta magnitude
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Origin: AAS CD-ROM series, Volume 8, 1997         Lee Brotzman [ADS] 04-Apr-1997
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(End)                                                         [CDS]  03-Jul-1997