- ID:
- ivo://CDS.VizieR/J/MNRAS/448/1738
- Title:
- Coefficients for passband extinctions
- Short Name:
- J/MNRAS/448/1738
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a method for obtaining the likelihood function of distance and extinction to a star given its photometry. The other properties of the star (its mass, age, metallicity and so on) are marginalized assuming a simple Galaxy model. We demonstrate that the resulting marginalized likelihood function can be described faithfully and compactly using a Gaussian mixture model. For dust mapping applications we strongly advocate using monochromatic over bandpass extinctions, and provide tables for converting from the former to the latter for different stellar types.
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- ID:
- ivo://CDS.VizieR/J/AJ/146/123
- Title:
- Coefficients in JHKs for the Wilson-Devinney code
- Short Name:
- J/AJ/146/123
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- In this paper, radial velocity and VI- and JHKs (Two Micron All Sky Survey) band photometric data of the detached system HV Cnc have been analyzed. The primary component of HV Cnc, which is a member of the M67 cluster, is suspected to be either a blue straggler or turn-off star. The system is a single-lined spectroscopic binary and its light curve shows a total eclipse. Spectroscopic observations of the system revealed the third component, which shows contribution to the total light of the system. Light curve and radial velocity data have been analyzed using the Wilson-Devinney (W-D) code and JHKs filter definitions computed for the W-D code in this work. Our analysis shows that the mass and radius of the primary and secondary components are 1.31M_{sun}_, 0.52M_{sun}_, 1.87R_{sun}_, and 0.48R_{sun}_, respectively. All results are compared with previously published literature values and discussed.
- ID:
- ivo://CDS.VizieR/J/A+AS/93/121
- Title:
- CO emission from a sample of IRAS sources
- Short Name:
- J/A+AS/93/121
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The first results from a survey of circumstellar CO(1-0) emission are presented. The sources were selected from the IRAS point source catalog according to the IRAS color criteria described in van der Veen and Habing (1988A&A...194..125V). The sources have good quality fluxes at 12, 25, and 60 microns, flux densities larger than 20Jy at 25{mu}m, and are situated more than 5{deg} away from the Galactic plane. The survey is undertaken to study the relationship between mass loss rates, dust properties, and the evolution along the AGB. The sample consists of 787 sources and contains both oxygen and carbon-rich stars, including Mira variables, OH/IR objects, protoplanetary nebulae, planetary nebulae, and 60-micron excess sources. So far, 519 objects, situated on both the northern and the southern sky, have been observed; 163 sources were found to have circumstellar CO emission, and in 58 of these CO emission has not previously been detected.
- ID:
- ivo://CDS.VizieR/J/ApJ/606/L73
- Title:
- CO emission of 5 Herbig Ae stars
- Short Name:
- J/ApJ/606/L73
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We explore the high-resolution ({Lambda}/{Delta}{Lambda}=25000;{Delta}v=12km/s) M-band (4.7-5.1{mu}m) spectra of several disk-dominated Herbig Ae (HAe) systems: AB Aur, MWC 758, MWC 480, HD 163296, and VV Ser.
- ID:
- ivo://CDS.VizieR/J/other/PASA/17.92
- Title:
- CO emission towards Southern dark clouds
- Short Name:
- J/other/PASA/17.
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Using the 22-m 'Mopra' antenna (near Coonabarabran, NSW) of the Australia Telescope National Facility (ATNF), we have observed emission from the 115-GHz J=1-0 transition of CO towards the centre of each of the 1101 clouds listed in the Hartley et al. Catalogue of Southern Dark Clouds (SDC, Cat. <VII/191>). The velocity range covered was -96 to +70km/s, with a velocity resolution of 0.120km/s. CO was detected at 1049 of the positions, with 367 spectra showing emission at more than one radial velocity. Here we present the most comprehensive general survey of the SDC catalogue, with the intensity, velocity and half-width of the CO detection and a code describing the profile shape. The presence of blue- or red-shifted wings in many observations can provide a starting point in searches for star-forming regions.
- ID:
- ivo://CDS.VizieR/J/A+A/594/A117
- Title:
- CO-H2 and complex organic molecules in TMC-1C
- Short Name:
- J/A+A/594/A117
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Almost 200 different species have been detected in the interstellar medium (ISM) during the last decades, revealing not only simple species but complex molecules with more than 6 atoms. Other exotic compounds, like the weakly-bound dimer (H_2_)_2_, have also been detected in astronomical sources like Jupiter. We aim at detecting for the first time the CO-H_2_ van der Waals complex in the ISM, which if detected can be a sensitive indicator for low temperatures. We use the IRAM30m telescope, located in Pico Veleta (Spain), to search for the CO-H_2_ complex in a cold, dense core in TMC-1C (with a temperature of 10K). All the brightest CO-H_2_ transitions in the 3mm (80-110GHz) band have been observed with a spectral resolution of 0.5-0.7km/s, reaching a rms noise level of 2mK. The simultaneous observation of a broad frequency band, 16GHz, has allowed us to conduct a serendipitous spectral line survey. No lines belonging to the CO-H_2_ complex have been detected. We have set up a new, more stringent upper limit for its abundance to be [CO-H_2_]/[CO]=5x10^-6^, while we expect the abundance of the complex to be in the range 10^-8^-10^-3^. The spectral line survey has allowed us to detect 75 lines associated with 41 different species (including isotopologues). We detect a number of complex organic species, e.g. methyl cyanide (CH_3_CN), methanol (CH_3_OH), propyne (CH_3_CCH) and ketene (CH_2_CO), associated with cold gas (excitation temperatures about 7K), confirming the presence of these complex species not only in warm objects but also in cold regimes.
- ID:
- ivo://CDS.VizieR/J/A+A/399/795
- Title:
- Co III electron-impact broadening parameters
- Short Name:
- J/A+A/399/795
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- In hot star atmospheres, the Stark broadening mechanism is the main pressure broadening mechanism. An interesting application where such a mechanism is of interest is the modeling and investigation of hot star spectra, stellar atmospheres and subphotospheric layers. Consequently, for the investigation and modeling of the Hg-Mn star and other type of hot star atmospheres, the Stark broadening parameters for Co III spectral lines may be of interest. Here we present Stark broadening data for 20 Co III spectral lines (from a^6^D-z^6^D^o^ and a^6^D-z^6^F^o^ Co III multiplets), as a function of temperature, calculated by using the modified semi-empirical approach. The importance of the electron-impact effect in the case of the Co III 194.98nm line for several stellar atmosphere models has been tested.
- ID:
- ivo://CDS.VizieR/J/A+AS/130/541
- Title:
- Co II oscillator strengths
- Short Name:
- J/A+AS/130/541
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- In table 2 the log(gf) values for the 3d^8^+3d^7^ 4s-->3d^7^ 4p electric dipole (E1) transitions are given. This system is selected by cutting off energy values larger than 120,000cm^-1^ of both the even and the odd system in the final printing procedure; only log(gf) values larger than -3 are included. The first column of this table shows the wavelength obtained from the energy differences between the experimental level values. Wavelengths below 2000 Angstrom are given as vacuum wavelengths and above 2000 Angstrom as air wavelengths. The second column gives the log(gf) values followed by the J-value, energy value and the name of the lower (even) level. The first character of the level name designates the configuration number: for the even levels '1' refers to 3d^8^ and '2' to 3d^7^ 4s; for the odd levels '1' refers to 3d^7^ 4p. An '*' after the energy value indicates that the level is known, in which case the experimental level value is given. When unknown, the calculated energy value is given and used to approximate the wavelength. The A-values for the forbidden lines given in table 7 are restricted to the magnetic dipole (M1) and electric quadrupole (E2) transitions within the 3d^8^+3d^7^ 4s configurations, from levels with an energy of less than 50,000 cm^-1^ above the ground and with A-values larger than 10^-3^s^-1^. The level with the lower J-value is given first in the designation of the transition. The remaining columns are similar to the corresponding ones in table 2. The first character of the level name designates the configuration number: for the even levels '1' refers to 3d^8 and '2' to 3d^7 4s. An '*' after the energy value indicates that the level is known, in which case the experimental level value is given. When unknown, the calculated energy value is given and used to approximate the wavelength.
- ID:
- ivo://CDS.VizieR/J/A+AS/129/147
- Title:
- Co II radiative transition probabilities
- Short Name:
- J/A+AS/129/147
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Radiative transition probabilities have been calculated for the magnetic dipole (M1) and electric quadrupole (E2) transitions connecting the 47 metastable energy levels in the 3d^8^, 3d^7^ 4s and 3d^6^ 4s^2^ configurations in Co II. The most important configuration interaction (CI) and relativistic effects have been taken into account in the computations carried out with the help of the relativistic Hartree-Fock (HFR) method combined with a semi-empirical optimization of the radial parameters.
- ID:
- ivo://CDS.VizieR/J/A+A/412/657
- Title:
- CO in cooling flow of clusters of galaxies
- Short Name:
- J/A+A/412/657
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The results of a CO line survey in central cluster galaxies with cooling flows are presented. Cold molecular gas is detected with the IRAM 30m telescope, through CO(1-0) and CO(2-1) emission lines in 6-10 among 32 galaxies. The corresponding gas masses are between 3x10^8^ and 4x10^10^M_{sun}. These results are in agreement with recent CO detections by Edge (2001MNRAS.328..762E). A strong correlation between the CO emission and the H{alpha} luminosity is also confirmed. Cold gas exists in the center of cooling flow clusters and these detections may be interpreted as evidence of the long searched for very cold residual of the hot cooling gas.