COMMISSION 27 OF THE I. A. U.
              INFORMATION BULLETIN ON VARIABLE STARS
                           Number 3418

                                              Konkoly Observatory
                                              Budapest
                                              11 January 1990

                                              HU ISSN 0374 - 0676


    V1129 Cyg IS NOT AN OPTICAL COUNTERPART OF IRC+30374=AFGL 2417

   In the AFGL infrared survey (Price and Walker, 1976) the source AFGL
2417 = IRC+30374 is, erroneously as shown below, identified with the Mira
star V1129 Cyg. On the other hand, in the New Catalogue of Suspected Variables 
(NSV) the infrared source IRC+30374 is designated by a number 12165
according to the correct idea, that V1129 Cyg is not its optical counterpart
(Kukarkin et al., 1982). Nevertheless, the misidentification has been repeated 
in several papers as well as in the Catalog of Infrared Observations
(Schmitz et al., 1987).
   Trying to stop such a confusion we present observational data obtained
with the Baldone Schmidt telescope giving evidence that the star V1129 Cyg
and the infrared source IRC+30374=AFGL 2417 are different objects.
   1. On the Kodak IN infrared spectral plate taken 1986 Sept 13/14 nearly 
20 arcsec SSW off the position of variable star 112.1906 (=V1129 Cyg)
shown on finding chart in the paper of Wachmann (1964) is seen a spectrum
of a red star with absorption features characteristic for spectral type M.
Nearly 5 arcmin to the east there is another very red object (Fig.1) the
spectrum of which has features typical for carbon stars. Evidently, the
last one corresponds to the infrared source IRC+30374, because IRC+30374 is
classified by Vogt (1973) as a carbon star. Besides, Altamore et al. (1980)
identified IRC+30374 with the star No.2754 of the General Catalogue of Cool
Carbon Stars (Stephenson, 1973).

   2. Equatorial coordinates of both objects marked in Fig. 1 we determined 
from direct infrared Kodak IN plate:
                            
       V1129 Cyg     19h29m50s2: +27d51'54.8 (1900.0)
         "           19 31 51.1  +27 58 21.8 (1950.0)
       IRC+30374     19 30  7.9  +27 51 4.5 (1900.0)
         "           19 32  9.0  +27 57 32.6 (1950.0)

The necessary reductions were performed by the Turner method using seven
stars from AGK 3 catalogue. The rms scatter of each coordinate is not
greater than 0.7".


                             [FIGURE 1]

 Figure 1. Finding charts of V1129 Cyg and IRC+30374 = NSV 12165 in a)
 infrared and b) visual light from the negatives taken with the
 Baldone Schmidt telescope. On the V chart the object IRC+30374 is seen
 ~0.1 arcmin SE from a much brighter star.


   The above position of V1129 Cyg is in a good agreement with the coordinates 
of the star given in the GCVS. In the case of IRC+30374 the difference 
between the above position and those given in IRC and AFGL are larger,
but does not exceed one arcmin. The disagreement with the coordinates of
No.2754 in GCVS (Stephenson, 1974) is larger - 1.5 arcmin, which might be
attributed to lower precision of the coordinates in the GCVS. In any case
we could not find another sufficiently red star near the position of IRC
+30374.
   3. From the brightness estimates of these two objects on a dozen of
direct infrared plates and from published data on infrared photometry we
can judge that the star of spectral type M is a long-period variable with a
cycle length similar to that noted in the GCVS for V1129 Cyg but the 
other - carbon star - is a variable with a cycle length of about 430 days.
   Thus, V1129 Cyg is a Mira star of spectral type M and NSV 12165 = IRC
+30374=AFGL 2417 a long-period variable carbon star. NSV 12165 is also 
identified with the IRAS point source 19321+2757 and classified from IRAS Low
Resolution Spectra as 43 or 30 like some other dust-enshrouded carbon stars
(Cheeseman et al., 1989).



                       A. ALKSNIS, M. EGLITE, I. PLATAIS
                       Radioastrophysical Observatory
                       Latvian Academy of Sciences
                       226524, Riga, Turgeneva 19
                       Latvia, U.S.S.R.



References:

Altamore, A., Smriglio, F., Bussoletti, E., Corsi, C.E., Rossi, L.: 1980,
        Astroph. Space Sc., Vol. 72, 159. [BIBCODE 1980Ap&SS..72..159A ]
Cheeseman, P., Stutz, J., Self, M., Taylor, W., Goebel, J., Volk, K.,
        Walker, H.: 1989, Automatic Classification of Spectra from
        the Infrared Astronomical Satellite (IRAS). NASA - RP 1217. [BIBCODE 1989NASRP1217.....C ]
Kukarkin, B.V., Kholopov, P.N., Artiukhina, N.M., Fedorovich, V.P., Frolov,
        M.S., Goranskij, V.P., Gorynya, N.A., Karitskaya, E.A.,
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        G.I., Perova, N.B., Ponomareva, G.A., Samus, N.N., Shugarov,
        S.Yu.: 1982, New Catalogue of Suspected Variable Stars,
        "Nauka", 359 p.
Price, S.D., Walker, R.G.: 1976, The AFGL four color infrared sky survey.
        AFGL-TR-76-0208. [BIBCODE 1976afci.book.....P ]
Schmitz, M., Mead, J.M., Gezari, D.Y.: 1987, Infrared Source Cross-Index.
        NASA RP-1182.
Stephenson, C.B.: 1973, Publ. Warner Swasey Obs. Vol. 1, No.4, 79 p. [BIBCODE 1973PW&SO...1.....S ]
Stephenson, C.B.: 1974, Publ. Warner Swasey Obs. Vol. 1, No.5.
Vogt, S.S.: 1973, Astron. J. Vol. 78, 389. [BIBCODE 1973AJ.....78..389V ]
Wachmann, A.A.: 1964, Astron. Abhandl. Hamburger Sternw. Bd. 6, No.3,3.