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J/A+A/391/641  Spectroscopic study of sigma Geminorum from IUE  (Ekmekci+, 2002)

IUE-newsips spectra of σ Geminorum Ekmekci F., Karakus O. <Astron. Astrophys. 391, 641 (2002)> =2002A&A...391..641E
ADC_Keywords: Binaries, spectroscopic ; Spectra, ultraviolet ; Equivalent widths Keywords: stars: activity - stars: atmospheres - stars: binaries: spectroscopic - stars: chromospheres - stars: individual: σ Gem - stars: late-type Abstract: The IUE spectra of σ Gem have been taken from the NASA IUE archive using IDL (Interactive Data Language). The spectra have been observed in 1979-1986 period. All the spectra analysed in the present study have NEWSIPS reductions and consist of 25 LWP, 8 LWR and 5 SWP images in high resolution, and 2 LWP and 14 SWP images in low dispersion. The emission lines, identified as activity indicators and originating in the chromosphere and transition region, are seen in the spectra. The emission line fluxes and equivalent widths are computed based on Gaussian profile fitting procedures to examine the existence of any line flux variation that depends on time or orbital phase. It was found that there is a flux variation with time and orbital phase that is in good agreement with the photometric light curve variation. By comparing the flux variation with simultaneous light curve variation, it can be shown that there is a relation between the ultraviolet flux variation and the spot activity of the system, as shown by Ayres et al. (1984ApJ...279..197A) and Engvold et al. (1988A&A...192..234E) based on their IUE (with IUESIPS reduction) spectral analysis. Moreover, it was inferred that there is no ultraviolet excess in σ Gem by comparing the spectra of β Gem taken as a comparison star. The Mg II h and k radial velocity curves of σ Gem were in a good agreement with data obtained by Eker (1986MNRAS.221..947E) and Duemmler et al. (1997A&AS..123..209D). Objects: ---------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------- 07 43 18.7 +28 53 00 sigma Gem = HD 62044 ---------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3a.dat 161 12 The integrated line fluxes appeared in the low dispersion IUE spectra of sigma Gem table3b.dat 161 12 Equivalent widths of emission lines appeared in the low dispersion IUE spectra of sigma Gem mg2.dat 93 33 The integrated fluxes and equivalent widths of MgIIh(lambda 2803Å) and MgIIk(lambda 2796Å) lines, and the MgII radial velocities, deduced from high resolution IUE spectra of sigma Gem (tables 4, 5 and 7) table6.dat 49 12 Some integrated emission line fluxes of SWP high resolution IUE spectra of sigma Gem
Byte-by-byte Description of file: table3a.dat
Bytes Format Units Label Explanations
1- 5 A5 --- Ion Ion designation 8- 11 F4.2 10-15W/m2 FSWP06872 Flux on SWP06872 image 13- 16 F4.2 10-15W/m2 e_FSWP06872 rms uncertainty on FSWP06872 19- 22 F4.2 10-15W/m2 FSWP06873 Flux on SWP06873 image 24- 27 F4.2 10-15W/m2 e_FSWP06873 rms uncertainty on FSWP06873 30- 33 F4.2 10-15W/m2 FSWP06899 Flux on SWP06899 image 35- 38 F4.2 10-15W/m2 e_FSWP06899 rms uncertainty on FSWP06899 41- 44 F4.2 10-15W/m2 FSWP07265 Flux on SWP07265 image 46- 49 F4.2 10-15W/m2 e_FSWP07265 rms uncertainty on FSWP07265 52- 55 F4.2 10-15W/m2 FSWP07970 Flux on SWP07970 image 57- 60 F4.2 10-15W/m2 e_FSWP07970 rms uncertainty on FSWP07970 63- 66 F4.2 10-15W/m2 FSWP24090 ? Flux on SWP24090 image 68- 71 F4.2 10-15W/m2 e_FSWP24090 ? rms uncertainty on FSWP24090 75- 78 F4.2 10-15W/m2 FSWP24099 ? Flux on SWP24099 image 80- 83 F4.2 10-15W/m2 e_FSWP24099 ? rms uncertainty on FSWP24099 86- 89 F4.2 10-15W/m2 FSWP24100 ? Flux on SWP24100 image 91- 94 F4.2 10-15W/m2 e_FSWP24100 ? rms uncertainty on FSWP24100 97-100 F4.2 10-15W/m2 FSWP24101 ? Flux on SWP24101 image 102-105 F4.2 10-15W/m2 e_FSWP24101 ? rms uncertainty on FSWP24101 108-111 F4.2 10-15W/m2 FSWP24171 ? Flux on SWP24171 image 113-116 F4.2 10-15W/m2 e_FSWP24171 ? rms uncertainty on FSWP24171 119-122 F4.2 10-15W/m2 FSWP24172 ? Flux on SWP24172 image 124-127 F4.2 10-15W/m2 e_FSWP24172 ? rms uncertainty on FSWP24172 130-133 F4.2 10-15W/m2 FSWP24173 ? Flux on SWP24173 image 135-138 F4.2 10-15W/m2 e_FSWP24173 ? rms uncertainty on FSWP24173 141-144 F4.2 10-15W/m2 FSWP24178 ? Flux on SWP24178 image 146-149 F4.2 10-15W/m2 e_FSWP24178 ? rms uncertainty on SWP24178 152-155 F4.2 10-15W/m2 FSWP24179 ? Flux on SWP24179 image 157-160 F4.2 10-15W/m2 e_FSWP24179 ? rms uncertainty on FSWP24179
Byte-by-byte Description of file: table3b.dat
Bytes Format Units Label Explanations
1- 5 A5 --- Ion Ion designation 8- 11 F4.2 0.1nm EW0.64A ? Equivalent width on phase 0.64 13- 16 F4.2 0.1nm e_EW0.64A ? rms uncertainty on EW0.64A 19- 22 F4.2 0.1nm EW0.64B ? Equivalent width on phase 0.64 24- 27 F4.2 0.1nm e_EW0.64B ? rms uncertainty on EW0.64B 30- 33 F4.2 0.1nm EW0.80 ? Equivalent width on phase 0.80 35- 38 F4.2 0.1nm e_EW0.80 ? rms uncertainty on EW0.80 41- 44 F4.2 0.1nm EW0.95 ? Equivalent width on phase 0.95 46- 49 F4.2 0.1nm e_EW0.95 ? rms uncertainty on EW0.95 52- 55 F4.2 0.1nm EW0.03 ? Equivalent width on phase 0.03 57- 60 F4.2 0.1nm e_EW0.03 ? rms uncertainty on EW0.03 63- 66 F4.2 0.1nm EW0.13 ? Equivalent width on phase 0.13 68- 71 F4.2 0.1nm e_EW0.13 ? rms uncertainty on EW0.13 74- 78 F5.2 0.1nm EW0.18A ? Equivalent width on phase 0.18 80- 83 F4.2 0.1nm e_EW0.18A ? rms uncertainty on EW0.18A 86- 89 F4.2 0.1nm EW0.18B ? Equivalent width on phase 0.18 91- 94 F4.2 0.1nm e_EW0.18B ? rms uncertainty on EW0.18B 97-100 F4.2 0.1nm EW0.18C ? Equivalent width on phase 0.18 102-105 F4.2 0.1nm e_EW0.18C ? rms uncertainty on EW0.18C 108-111 F4.2 0.1nm EW0.78 ? Equivalent width on phase 0.78 113-116 F4.2 0.1nm e_EW0.78 ? rms uncertainty on EW0.78 119-122 F4.2 0.1nm EW0.79A ? Equivalent width on phase 0.79 124-127 F4.2 0.1nm e_EW0.79A ? rms uncertainty on EW0.79A 130-133 F4.2 0.1nm EW0.79B ? Equivalent width on phase 0.79 135-138 F4.2 0.1nm e_EW0.79B ? rms uncertainty on EW0.79B 141-144 F4.2 0.1nm EW0.84A ? Equivalent width on phase 0.84 146-149 F4.2 0.1nm e_EW0.84A ? rms uncertainty on EW0.84A 152-155 F4.2 0.1nm EW0.84B ? Equivalent width on phase 0.84 157-160 F4.2 0.1nm e_EW0.84B ? rms uncertainty on EW0.84B
Byte-by-byte Description of file: mg2.dat
Bytes Format Units Label Explanations
1- 8 A8 --- Image Image designation 10- 19 F10.2 d JD Julian date 21- 24 F4.2 --- Phase Phase 26- 30 F5.2 10-5W/m2 FMgIIh Flux of MgII h(lambda 2803) line 32- 35 F4.2 10-5W/m2 e_FMgIIh rms uncertainty on FMgIIh 37- 40 F4.2 0.1nm EWMgIIh Equivalent width of MgII h(lambda 2803) line 42- 46 F5.2 0.1pm e_EWMgIIh rms uncertainty on EWMgIIh 48- 52 F5.2 10-5W/m2 FMgIIk ? Flux of MgII k(lambda 2796) line 54- 57 F4.2 10-5W/m2 e_FMgIIk ? rms uncertainty on FMgIIk 59- 62 F4.2 0.1nm EWMgIIk ? Equivalent width of MgII k(lambda 2796) line 64- 68 F5.2 0.1pm e_EWMgIIk ? rms uncertainty on EWMgIIk 70- 74 F5.2 km/s RV(MgIIh) ? Radial velocity of MgII h line 76- 80 F5.2 km/s e_RV(MgIIh) ? rms uncertainty on RV(MgIIh) 82- 86 F5.2 km/s RV(MgIIk) ? Radial velocity of MgII k line 89- 93 F5.2 km/s e_RV(MgIIk) ? rms uncertainty on RV(MgIIk)
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 5 A5 --- Ion Ion designation 7- 10 I4 0.1nm Lambda Wavelength of the ion 12- 15 F4.2 10-15W/m2 FSWP16943 Flux on image SWP16943, at JD=2445099.86 (10.May.82), on phase 0.50 17- 20 F4.2 10-15W/m2 FSWP16944 Flux on image SWP16944, at JD=2445100.86 (11.May.82), on phase 0.55 22- 25 F4.2 10-15W/m2 FSWP24078 Flux on image SWP24078, at JD=2445973.13 (29.Sep.84), on phase 0.05 27- 30 F4.2 10-15W/m2 FSWP24107 Flux on image SWP24107, at JD=2445977.43 (03.Oct.84), on phase 0.28 32- 35 F4.2 10-15W/m2 FSWP24124 Flux on image SWP24124, at JD=2445979.41 (05.Oct.84), on phase 0.36
Table 8: Orbital elements of sigma Gem obtained from the MgII radial velocity curve analysis. The results of Duemmler et al. (1997A&AS..123..209D) and of Bopp & Dempsey (1989PASP..101..516B) are given for a comparison -------------------------------------------------------------------------------- Orbital elements Duemmler et al. (1997) Bopp & Dempsey (1989) This Study -------------------------------------------------------------------------------- P(day) 19.604471±0.00 19.60447±0.00007 19.607±0.008 Gamma (km/s) 44.48±0.14 43.78±0.17 49.42±1.87 K (km/s) 35.06±0.19 34.79±0.25 34.86±2.33 e 0.00±0.00 0.02110±0.0069 0.00 omega (deg) 0.00±0.00 160±20 0.00 Tconj (HJD) 2447227.220±0.015 2447227.08±0.02 2445972.53±0.28 Table 9: The integrated fluxes for continuum levels of beta Gem and sigma Gem between 2200Å and 3350Å. -------------------------------------------------------------------------------- Star Te(K) Image JD f(int) (erg/cm2) F(int) (erg/cm2) -------------------------------------------------------------------------------- beta Gem 4800 LWR15070 2447579.33 6.82(0.03) E(-8) 1.12(0.05) E(+8) sigma Gem 4600 LWR15076 2447580.33 3.14(0.08) E(-9) 9.88(0.25) E(+7) sigma Gem 4600 LWR15077 2447580.36 3.49(0.06) E(-9) 11.00(0.89) E(+7) Table 10: The ratios of integrated continuum (surface) fluxes. -------------------------------------------------------------------------------- sigma Gem beta Gem DELTA PHI -------------------------------------------------------------------------------- d(pc) R/R d(pc) R/R -------------------------------------------------------------------------------- 58.8 14.7 10.34 11.3 0.9288 1.1012 58.8 12.0 10.34 11.3 1.3938 1.6525 58.8 14.7 10.34 9.0 0.5892 0.6985 58.8 12.0 10.34 9.0 0.8842 1.0483 Table 11: The same ratios as given in Table 10 but with different radii and distances given in the HIP catalogue. -------------------------------------------------------------------------------- sigma Gem beta Gem DELTA PHI -------------------------------------------------------------------------------- d(pc) R/R{sun} d(pc) R/R{sun} -------------------------------------------------------------------------------- 37.5 8.8 10.34 11.3 1.0542 1.2498 37.5 12.0 10.34 11.3 0.5669 0.6721 37.5 8.8 10.34 9.0 0.6687 0.7928 37.5 12.0 10.34 9.0 0.3596 0.4264 Acknowledgements: Fehmi Ekmekci
(End) Patricia Bauer [CDS] 06-Aug-2002
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