- ID:
- ivo://CDS.VizieR/J/A+A/614/A84
- Title:
- C/O vs Mg/Si ratios in solar type stars
- Short Name:
- J/A+A/614/A84
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We aim to present a detailed study of the magnesium-to-silicon and carbon-to-oxygen ratios (Mg/Si and C/O) and their importance in determining the mineralogy of planetary companions. Using 499 solar-like stars from the HARPS sample, we determined C/O and Mg/Si elemental abundance ratios to study the nature of the possible planets formed. We separated the planetary population in low-mass planets (<30M_{sun}_) and high-mass planets (>30M_{sun}_) to test for a possible relation with the mass. We find a diversity of mineralogical ratios that reveal the different kinds of planetary systems that can be formed, most of them dissimilar to our solar system. The different values of the Mg/Si and C/O can determine different composition of planets formed. {We found that 100% of our planetary sample present C/O<0.8. 86% of stars with high-mass companions present 0.8>C/O>0.4, while 14% present C/O values lower than 0.4. Regarding Mg/Si, all stars with low-mass planetary companion showed values between one and two, while 85% of the high-mass companion sample does. The other 15% showed Mg/Si values below one. No stars with planets were found with Mg/Si>2. Planet hosts with low-mass companions present C/O and Mg/Si similar to those found in the Sun, whereas stars with high-mass companions have lower C/O.
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Search Results
4022. COYOTES II
- ID:
- ivo://CDS.VizieR/J/A+A/299/89
- Title:
- COYOTES II
- Short Name:
- J/A+A/299/89
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- (no description available)
4023. CPASJ2 catalogue
- ID:
- ivo://CDS.VizieR/J/A+AS/136/1
- Title:
- CPASJ2 catalogue
- Short Name:
- J/A+AS/136/1
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- According to the cooperation between Beijing, San Juan and La Plata Astronomical Observatories, the photoelectric astrolabe Mark II(PAII) of the Beijing Astronomical Observatory was moved and installed at the San Juan Observatory, Argentina in January, 1992 for observations of the catalogue of stars in the southern hemisphere. The first observing period was from Feb. 23, 1992 to Mar. 31, 1997. Using the data observed in San Juan with the instrument during this period, residuals for 11002 stars are reduced from about 405700 observations of stars over 1532 days. The mean precision of the residuals is +/-0.043". The Second Catalogue of Stars (CPASJ2) has been compiled from double transits at both the eastern and western passages. There are 5241 stars in this catalogue, including 1225 FK5/FK4Supp stars, 794 FK5Ext stars, 1084 SRS stars, 937 CAMC4 stars, 310 GC stars and 891 IMF stars. The mean precisions are +/-3.2ms and +/-0.057" in right ascension and declination, respectively. The magnitudes of stars are from 2.0 to 11.5. The declinations are from -3{deg} to -60{deg}. The mean epoch is 1994.9. Finally, systematic corrections of(CPASJ2-FK5) are given.
4024. CPASJ1 catalogue
- ID:
- ivo://CDS.VizieR/J/A+AS/118/1
- Title:
- CPASJ1 catalogue
- Short Name:
- J/A+AS/118/1
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- On the basis of the data observed with the photoelectric astrolabe Mark II(PA II) of Beijing Astronomical Observatory in San Juan of Argentina from Feb. 23, 1992 to Feb. 28, 1995, residuals of 7200 stars are reduced according to about 230000 observations of stars. The mean precision of the residuals is +/-0.046". Using the data, the first catalogue of stars (CPASJ1) have been compiled. There are 2980 stars in this catalogue included 989 FK5/FK4Supp stars, 658 FK5Ext stars, 387 SRS stars, 687 CAMC4 stars, 192 GC stars, and 72 Hipparcos stars. The mean precisions are +/-3.2ms and +/-0.061" in right ascensions and declinations, respectively. The magnitudes of stars are from 2mag to 11.3mag. The declinations are from -3deg to -60deg. The mean epoch is 1993.6. Finally, systematic corrections of(CPASJ1-FK5) are given.
4025. CPASJ3 catalogue
- ID:
- ivo://CDS.VizieR/J/A+A/430/327
- Title:
- CPASJ3 catalogue
- Short Name:
- J/A+A/430/327
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Resulting from the cooperation between Beijing, San Juan and La Plata Astronomical Observatories, the photoelectric astrolabe Mark II(PAII) of the Beijing Astronomical Observatory was moved and installed at the San Juan Observatory, Argentina in January, 1992 for observations of stars in the southern hemisphere. Using the data observed with the instrument from Feb. 23 1992 to Mar. 11, 2000 over 2382 days, the Third San Juan photoelectric astrolabe catalogue has been compiled from double transits at both the eastern and western passages. There are 6762 stars in this catalogue, including 6156 Hipparcos stars (in which there are 69 radio stars), 8 FK5 stars, 47 SRS stars, 551 CAMC4 stars. The mean precisions are +/-3.0ms and +/-0.053"' in right ascension and declination, respectively. The magnitudes of stars are from 1.0 to 11.5. The declinations are from -3{deg} to -60{deg}. The mean epoch is 1996.3. Systematic corrections of (CPASJ3-Hipp) are given.
- ID:
- ivo://CDS.VizieR/J/other/PBeiO/24.71
- Title:
- CPASJ1 position corrections
- Short Name:
- J/other/PBeiO/24
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Using the data observed with the Photoelectric Astrolabe Mark II (PA II) of the Beijing Astronomical Observatory during the period from Feb. 1992 to Oct. 1993 in San Juan of Argentina, the first catalogue of stars (PASJ1, Cat. <J/A+AS/118/1>) have been compiled. It consists of 1400 stars included 682 FK5/FK4 Supp stars. 433 FK5 Ext stars and 285 CAMC stars (1, 1989). The mean precisions of delta alpha's and delta delta's are +/-3.2ms and 0.055", respectively. The mean epoch is 1992.9. Finally, systematic corrections of (PASJ1-FK5) are given.
- ID:
- ivo://CDS.VizieR/J/A+A/310/893
- Title:
- C_2_ Phillips and CN Red bands in HD 56126
- Short Name:
- J/A+A/310/893
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the detection of molecular absorption lines in the optical spectrum of the post-AGB star HD 56126. The C_2_ Phillips A^1^{PI}_u_-X^1^{SIGMA}^+^_g_(1,0), (2,0), and (3,0); Swan d^3^{PI}_g_-a^3^{PI}_u_(0,0) and (1,0); and CN Red system A^2^{PI}-X^2^{SIGMA}^+^ (1,0), (2,0), (3,0), and (4,0) bands have been identified. From the identification of the molecular bands we find an expansion velocity of 8.5+/-0.6km/s independent of excitation condition or molecular specie. On the basis of the expansion velocity, rotational temperatures, and molecular column densities we argue that the line-forming region is the AGB remnant. This is in agreement with the expansion velocity derived from the CO lines. We find column densities of logN_C_2__=15.3+/-0.3cm^-2^ and logN_CN_=15.5+/-0.3cm^-2^, and rotational temperatures of T_rot_=242+/-20K and T_rot_=24+/-5K respectively for C_2_ and CN. By studying molecular line absorption in optical spectra of post-AGB stars we have found a new tracer of the AGB remnant. From comparison with the results of CO and IR observations it is possible to obtain information on non-spherical behavior of the AGB remnant. Using different molecules with different excitation conditions it should be possible to study the AGB remnant as a function of the distance to the star, and thus as a function of the evolutionary status of the star on the AGB.
4028. CPMDS catalogue
- ID:
- ivo://CDS.VizieR/J/A+A/521/A4
- Title:
- CPMDS catalogue
- Short Name:
- J/A+A/521/A4
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a catalogue of 2572 new double stars with common proper motion and angular separation smaller than 2 arcminutes, found in PM2000 proper motion catalogue. To this catalogue we add an annex of 259 of common proper motion doublestars with angular separation between 2 and 5 arcminutes and proper motion larger than 50mas/yr. A by-product of this work was the identification in PM2000 and remeasurement of 926 WDS double stars.
- ID:
- ivo://CDS.VizieR/J/A+A/623/A111
- Title:
- 3C273 polarization over ALMA 1.3mm band
- Short Name:
- J/A+A/623/A111
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We studied the polarization behavior of the quasar 3C 273 over the 1mm wavelength band at ALMA with a total bandwidth of 7.5GHz across 223-243GHz at 0.8" resolution, corresponding to 2.1kpc at the distance of 3C 273. With these observations we were able to probe the optically thin polarized emission close to the jet base, and constrain the magnetic field structure. We computed the Faraday rotation measure using simple linear fitting and Faraday rotation measure synthesis. In addition, we modeled the broadband behavior of the fractional Stokes Q and U parameters (qu-fitting). The systematic uncertainties in the polarization observations at ALMA were assessed through Monte Carlo simulations. We find the unresolved core of 3C 273 to be 1.8% linearly polarized. We detect a very high rotation measure (RM) of (5.0+/-0.3)x10^5^rad/m^2^ over the 1 mm band when assuming a single polarized component and an external RM screen. This results in a rotation of >40{deg} of the intrinsic electric vector position angle, which is significantly higher than typically assumed for millimeter wavelengths. The polarization fraction increases as a function of wavelength, which according to our qu-fitting could be due to multiple polarized components of different Faraday depth within our beam or to internal Faraday rotation. With our limited wavelength coverage we cannot distinguish between the cases, and additional multifrequency and high angular resolution observations are needed to determine the location and structure of the magnetic field of the Faraday active region. Comparing our RM estimate with values obtained at lower frequencies, the RM increases as a function of observing frequency, following a power law with an index of 2.0+/-0.2, consistent with a sheath surrounding a conically expanding jet. We also detect ~0.2% circular polarization, although further observations are needed to confirm this result.
- ID:
- ivo://CDS.VizieR/J/A+AS/108/595
- Title:
- CP2 SrCrEu stars light variation
- Short Name:
- J/A+AS/108/595
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- (no description available)