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\IBVShead{5560}{31 August 2004}

\IBVStitle{Optical Spectrum of Y M\lowercase{ic}}

\IBVSauth{Czart, Krzysztof; Niedzielski, Andrzej}

\IBVSinsto{Torun Centre for Astronomy, Nicolaus Copernicus University, ul. Gagarina 11, PL-87100 Toru\'n, Poland; e-mail: {\tt kczart,aniedzi@astri.uni.torun.pl}}


\SIMBADobjAlias{Y Mic}{GSC 07479-01243}
\IBVSkey{spectral classification}

\IBVSabs{Optical spectrum (3500-9200 A) of Y Mic is presented.}
\IBVSabs{Spectral type and luminosity class of Y Mic is determined.}

\begintext

Y Mic = GSC 07479-01243 = TYC 7479-1243-1 = AAVSO 2100-34 (RA = 21\hr07\mm06\sec, DEC =
-34\deg16\arcm47\arcs) is an oxygen-rich (Jura \& Kleinmann 1992) semi-regular variable with period of 364 d. 
Neither spectral type nor optical spectra of this star 
are available in the literature.

Several exposures of this object were taken between  31.07 to 6.08.2003 with
the  1.9 m SAAO Radcliffe
telescope in Sutherland equipped with
grating spectrograph and SITe CCD camera in the range $\lambda$ 3500 -- 9200 \AA. A slit 0.250 mm and
gratings no. 9, 6, 5 were used. GG495 filter was used during exposures
red-ward above 6700\AA.\ \  A CuAr lamp spectra taken right after stellar spectra was used for
wavelength calibration. The spectra were reduced with standard IRAF procedures.

The wavelength range used for spectral classification of Y Mic is presented in Figure 1,
where most prominent spectral lines are identified as well. 
The spectral type of Y Mic is G2 I. The $\lambda$ 6560 \AA \ \  
hydrogen emission is present in the spectrum
of this star. Equivalent widths and FWHM's of most prominent lines are
presented in Table 1. No attempt was made to measure radial velocities.

Assuming the  relation between interstellar reddening and equivalent width of
the 8620\AA \ \ DIB of Munari (1999) we estimate $E_{B-V}$ = 0.16.

\textit{Acknowledgements:} This research made use of the SIMBAD
database, operated by the CDS at Strasbourg, France.
This paper uses observations made at the South African Astronomical
Observatory (SAAO). 
IRAF is distributed by the National Optical Astronomy Observatories,
which are operated by the Association of Universities for Research
in Astronomy, Inc., under cooperative agreement with the National
Science Foundation.

\references

Jura, M., Kleinmann, S. G., 1992, {\it ApJS}, {\bf 83}, 329

Munari, U., 1999, {\it BaltA}, {\bf 8}, 73

\endreferences


\begin{table}[!ht]
\small
\begin{center}
{\normalsize {\bf Table 1.} Y Mic: EW, FWHM and line center measurements.
} \vskip 2mm
\begin{tabular}{lcccl}
\hline
Identification    & Lambda [$\lambda$]   & EW [\AA]   & FWHM [\AA]  & Notes\\
\hline
CaII 3933 & 3932.652 & 12.93 & 13.73 &\\
CaII 3968 & 3966.937 & 9.46 & 10.16 &\\
FeI 4045 & 4042.684 & 0.53 & 2.30 &\\
SrII 4077 & 4074.153 & 1.03 & 3.21 &\\
HI 4101 & 4097.920 & 2.13 & 4.91 &\\
FeI 4144 & 4139.469 & 0.62 & 2.45 &\\
SrII 4215 & 4211.166 & 0.85 & 2.56 &\\
CaI 4226 & 4221.216 & 1.23 & 4.40 &\\
CH 4300 & 4292.251 & 7.17 & & G-band\\
FeI 4325 & 4320.097 & 0.73 & 2.48 &\\
HI 4340 & 4334.431 & 2.75 & 6.50 &\\
FeI 4383 & 4378.840 & 1.18 & 3.53 &\\
FeI, TiII 4444 & 4438.108 & 1.48 & 4.59 &\\
HI 4860 & 4859.715 & 2.39 & 5.20 &\\
MgI 5173 & 5174.062 & 1.60 & 4.12 &\\
MgI 5184 & 5179.190 & 0.92 & 3.68 &\\
FeI 5884 & 5884.063 & 0.52 & 2.15 &\\
NaI 5890 & 5889.929 & 0.64 & 2.17 & interstellar\\
NaI 5895 & 5895.251 & 0.30 & 3.23 & interstellar\\
CaI/FeI 6493/5 & 6495.359 & 0.75 & 3.14 &\\
HI 6563 & 6561.725 & 0.22 & 2.22 & emission + P Cygni\\
CaII 8498  & 8489.574 & 0.74 & 1.87 &\\
CaII 8542  & 8533.801 & 2.40 & 2.97 &\\
DIB 8620 & 8620.624 & 0.06 & 1.80 & interstellar\\
CaII 8662  & 8654.198 & 1.60 & 2.19 &\\
\end{tabular}
\end{center}
\end{table}



\IBVSfig{10.0cm}{5560-f1.eps}{Optical spectrum of Y Mic. Positions of the most significant spectral features are indicated. The intensity scale is relative to the continuum}
\IBVSfigKey{5560-f1.eps}{Y Mic}{spectrum}

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