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J/AZh/84/714  Optical spectral variability of BD+48 1220      (Klochkova+, 2007)

Evolutionary stage of the spectral variable BD+48 1220=IRAS 05040+4820. Klochkova V.G., Chentsov E.L., Tavolzhanskaya M.S., Panchuk V.E. <Astron. Zh. 84, 714 (2007)> =2007AZh....84..714K =2007ARep...51..642K
ADC_Keywords: Stars, variable; Spectroscopy Abstract: Based on high-resolution observations (R=60000 and 75000), we have studied the optical spectral variability of the star BD+48 1220, identified with the IR-source IRAS 05040+4820. We have measured the equivalent widths of numerous absorption lines of neutral atoms and ions at wavelengths from 4500 to 6760Å, as well as the corresponding radial velocities. We use model atmospheres to determine the effective temperature Teff=7900K, surface gravity log g=0.0, microturbulence velocity xit=6.0, and the abundances for 16 elements. The star's metallicity differs little from the solar value: [Fe/H]=-0.10dex. The main peculiarity of the chemical composition of the star is a large He-excess, derived from the HeI 5876Å absorption, [He/H]=+1.04, and the equally large O-excess, [O/Fe]=+0.72dex. The C-excess is small, [C/Fe]=+0.09dex, and the ratio [C/O]≤1. We obtained a revised relation for the light-metal abundances: [Na/Fe]=+0.87 with [Mg/Fe]=-0.31. The barium abundance is low, [Ba/Fe]=-0.84. The radial velocity of the star measured from photospheric absorption lines over three years of observations varies in the interval V=-(7-15)km/s. Time variable differential line shifts have been revealed. The entire set of available data (the luminosity Mv~-5mag, velocity Vlsr~-20km/s, metallicity [Fe/H]=-0.10, and peculiarities of the optical spectrum and chemical composition) confirms the status of BD+48 1220 as a post-AGB star with He- and O-excesses belonging to the Galactic disk. Objects: ----------------------------------------------------------- RA (2000) DE Designation(s) ----------------------------------------------------------- 05 07 50.296 +48 24 09.42 BD+48 1220 = IRAS 05040+4820 ----------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table4.dat 38 22 Elemental abundances in the atmosphere of BD+48 1220 (Teff=7900K, logg=0.0, xit6.0) tablea1.dat 77 550 Residual line intensities in fractions of continuum and HRV in spectra of BD+48 1220 obtained on various dates tablea2.dat 46 199 Atomic parameters of lines in spectrum of BD+48 1220 obtained on 2004-04-10, and corresponding atmospheric elemental abundances
Table1: Observations of BD+48 1220 with the 6-m telescope. ------------------------------------------------------ Date Integration Delta lambda R S/N s Å ------------------------------------------------------ 02.12.2002 2x3600 4520-6000 60000 75 09.09.2003 2x3600 4520-6000 60000 100 10.01.2004 2x3600 5280-6760 75000 85 08.03.2004 2x3600 5280-6760 75000 115 Table 3: Average heliocentric radial velocities for line groups and some individual lines, from spectra of BD+48 1220 obtained on different dates. ------------------------------------------------------------------------ Spectral details HRV (km/s) ----------------------------------------------- 2002-12-02 2003-09-09 2004-01-10 2004-03-08 ------------------------------------------------------------------------ Absorption cores: FeII, CrII, etc. (r->1) -14.8 -6.8 -15.3 -8.2 Halpha -27. -28. Hbeta -14.8 -10.6 Absorption line wings at r=0.90-0.95: - -14. -9.5 -15.5 -13.0 Maximum extension of short-wavelength wings: FeII(42) -70. -61. -65. : -70. Halpha -65. : -57. : Emission features: FeII(40, 46) -18. Halpha -15. -13. : Interstellar lines and bands: NaI -25,-3 -26,-2 -27,-2.5 -28,-2 DIBs -3. : -2.5: Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 2 A2 --- E Element 4- 8 F5.2 [-] logeps(E) Solar abundance for E element (1) 10- 13 A4 --- Ion Ion identification 17- 21 F5.2 [-] logeps(X) Star abundance for X element (1) 24- 27 F4.2 [-] e_logeps(X) ? rms uncertainty on logeps(X) 30- 31 I2 --- o_logeps(X) Number of lines used 34- 38 F5.2 [Sun] [X/Fe] Solar [X/Fe] abundance value (2)
Note (1): For logeps(H)=12.0 Note (2): Solar abundances are taken from Lodder, 2003ApJ...591.1220
Byte-by-byte Description of file: tablea1.dat
Bytes Format Units Label Explanations
1- 10 A10 --- El Element with multiplet number (1) 12- 18 F7.2 0.1nm Lambda ? Wavelength expressed in Angstroem 19 A1 --- u_Lambda [:] Uncertainty flag on Lambda 22- 25 F4.2 --- Res1 ? Residual line intensity for observation on 2002-12-02 26 A1 --- u_Res1 [:] Uncertainty flag on Res1 28- 32 F5.1 km/s HRV1 ? Heliocentric radial velocity for observation on 2002-12-02 33 A1 --- u_HRV1 [:] Uncertainty flag on HRV1 36- 39 F4.2 --- Res2 ? Residual line intensity for observation on 2003-09-09 40 A1 --- u_Res2 [:] Uncertainty flag on Res2 42- 46 F5.1 km/s HRV2 ? Heliocentric radial velocity for observation on 2003-09-09 47 A1 --- u_HRV2 [:] Uncertainty flag on HRV2 50- 53 F4.2 --- Res3 ? Residual line intensity for observation on 2004-01-10 54 A1 --- u_Res3 [:] Uncertainty flag on Res3 56- 60 F5.1 km/s HRV3 ? Heliocentric radial velocity for observation on 2004-01-10 61 A1 --- u_HRV3 [:] Uncertainty flag on HRV3 64- 67 F4.2 --- Res4 ? Residual line intensity for observation on 2004-03-08 68 A1 --- u_Res4 [:] Uncertainty flag on Res4 70- 74 F5.1 km/s HRV4 ? Heliocentric radial velocity for observation on 2004-03-08 75 A1 --- u_HRV4 [:] Uncertainty flag on HRV4 76- 77 A2 --- n_HRV4 [em] emission
Note (1): DIB = diffuse interstellar band Table 2: Diffuse bands in the spectrum of BD+48 1220 ------------------- lambda Wlambda Å mÅ ------------------- 5747 42 5780 227 5797 80 6195 25 6203 64 6270 64 6379 54 6425 13 6613 104 6699 17 -------------------
Byte-by-byte Description of file: tablea2.dat
Bytes Format Units Label Explanations
1- 4 A4 --- Ion Element 8- 15 F8.3 0.1nm Lambda Wavelength expressed in Angstroem 18- 24 F7.4 eV EP Excitation potentials of the lower level 28- 33 F6.3 [-] loggf Oscillator strength (log gf) 36- 38 I3 0.1nm EW Equivalent width 41- 46 F6.2 [-] log(eps) Abundance of the element (1)
Note (1): For log(eps(H)=12 in atmosphere of BD+48 1220 obtained with parameters Teff=7900K,logg=0.5, ξt=6.0. --------------------------------------------------------------------------------

(End) Veta Avedisova [INASAN] 08-Mar-2008
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