2012A&A...547A...7C


Query : 2012A&A...547A...7C

2012A&A...547A...7C - Astronomy and Astrophysics, volume 547A, 7-7 (2012/11-1)

The role of OH in the chemical evolution of protoplanetary disks. II. Gas-rich environments.

CHAPARRO MOLANO G. and KAMP I.

Abstract (from CDS):

We present a method for including gas extinction of cosmic-ray-generated UV photons in chemical models of the midplane of protoplanetary disks, focusing on its implications on ice formation and chemical evolution. Our goal is to improve on chemical models by treating cosmic rays, the main source of ionization in the midplane of the disk, in a way that is consistent with current knowledge of the gas and grain environment present in those regions. We trace the effects of cosmic rays by identifying the main chemical reaction channels and also the main contributors to the gas opacity to cosmic-ray-induced UV photons. This information is crucial in implementing gas opacities for cosmic-ray-induced reactions in full 2D protoplanetary disk models. We considered time-dependent chemical models within the range 1-10AU in the midplane of a T Tauri disk. The extinction of cosmic-ray-induced UV photons by gaseous species was included in the calculation of photorates at each timestep. We integrated the ionization and dissociation cross sections of all atoms/molecules over the cosmic-ray-induced UV emission spectrum of H2. By analyzing the relative contribution of each gas phase species over time, we were able to identify the main contributors to the gas opacity in the midplane of protoplanetary disks. At 1AU the gas opacity contributes up to 28.2% of the total opacity, including the dust contribution. At 3-5AU the gas contribution is 14.5% of the total opacity, and at 7-8AU it reaches a value of 12.2%. As expected, at 10-15AU freeze-out of species causes the gas contribution to the total opacity to be very low (6%). The main contributors to the gas opacity are CO, CO2, S, SiO, and O2. OH also contributes to the gas opacity, but only at 10-15AU.

Abstract Copyright:

Journal keyword(s): astrochemistry - circumstellar matter - cosmic rays - stars: variables: T Tauri, Herbig Ae/Be - circumstellar matter

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 * eta Crv PM* 12 32 04.2265302 -16 11 45.616473   4.658 4.294     F2V 291 0

Query : 2012A&A...547A...7C

Basic data :
* eta Crv -- High proper-motion Star
Origin of the objects types :

(Ref) Object type as listed in the reference "Ref"
(acronym) Object type linked to the acronym according to the original reference
() Anterior to 2007, before we can link the objet type to a reference, or given by the CDS team in some particular cases

Other object types:
* (*,BD,...), PM* (2007A&A,LTT,...), IR (IRAS,2MASS,...), UV (CEL,TD1), X (RBS,1RXS), ** (**,WDS), V* (NSV)
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
ICRS coord. (ep=J2000) :
12 32 04.2265302 -16 11 45.616473 (Optical) [ 0.16 0.11 90 ] A 2007A&A...474..653V
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
FK4 coord. (ep=B1950 eq=1950) :
12 29 29.3690877 -15 55 09.466442 [ 0.16 0.11 90 ]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
Gal coord. (ep=J2000) :
296.1792253722 +46.4216520644 [ 0.16 0.11 90 ]
Syntax of proper motions is : "pm-ra pm-dec [error ellipse] quality bibcode"
  • pm-ra : mu-ra*cos(dec) (expressed in the ICRS system in mas/yr)
  • pm-dec : mu-dec (expressed in the ICRS system in mas/yr)
  • [error ellipse] : error major axis and minor axis (in mas), orientation angle (in deg)
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the proper motion reference
Proper motions mas/yr :
-425.17 -57.23 [0.16 0.10 90] A 2007A&A...474..653V
Syntax of radial velocity (or/and redshift) is : "value [error] (wavelength) quality bibcode"
  • value : radial velocity or/and redshift (Heliocentric frame) according to your Output Options
    (redshift may be not displayed if the data value is <0 and the database inside value is a radial velocity)
  • [error] : error of the corresponding value displayed before
  • (wavelength) : wavelength range of the measurement : Rad, mm, IR, Opt, UV, Xray, Gam or  '∼'(unknown)
  • quality : flag of quality ( A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the value's origin
Radial velocity / Redshift / cz :
V(km/s) 0.69 [0.72] / z(spectroscopic) 0.000002 [0.000002] / cz 0.69 [0.72]
   (Opt) A 2018yCat.1345....0G
Syntax of parallax is : 'value quality [error] bibcode'
  • value : parallax value
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • [error] : mean error
  • bibcode : bibcode of the parallax reference
Parallaxes (mas):
54.70 [0.17] A 2007A&A...474..653V
Spectral type is made of 3 parts: %coding is composed of 4 parts :
  • the spectral type, which is made of a temperature class, eventually a luminosity class (roman number) and/or spectral peculiarities;
  • a quality letter: A=best quality→E=worst quality, {� } =unknown quality %
  • a quality letter: A=best quality -> E=worst quality, {� } =unknown quality
  • bibcode : bibcode of the spectral type reference
Spectral type:
F2V C 2006AJ....132..161G
Syntax of fluxes (or magnitudes) is : "filter-name (System) flux-value [error] quality MultVarFlags bibcode"
  • filter-name : U, B, V, R, I, G, J, H, K, u, g, r, i, z
  • (System) : may be AB (default is Vega)
  • flux-value : value of flux or magnitude
  • [error] : error value
  • quality : flag of quality of the flux value ( A=best quality -> E=worst quality, {� } =unknown quality)
  • MultVarFlags : Mult is zero or one char (J) for joined photometry ; Var can be zero or two chars (V[0-4])
  • bibcode : bibcode of the flux reference
Fluxes (6) :
B 4.658 [0.014] D 2000A&A...355L..27H
V 4.294 [0.009] D 2000A&A...355L..27H
G 4.1916 [0.0176] C 2018yCat.1345....0G
J 3.609 [0.250] D 2003yCat.2246....0C
H 3.372 [0.240] D 2003yCat.2246....0C
K 3.372 [0.302] D 2003yCat.2246....0C
SIMBAD within arcmin
', {sourceSize:12, color:'#30a090'})); aladin.on('objectClicked', function(object) { var objName=object.data.MAIN_ID; aladin.showPopup(object.ra,object.dec,'',''+ objName+''); });" title="Show Simbad objects"> Overlay Simbad points in this preview
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within arcsec The VizieR photometry tool allows for easy visualization of photometry points extracted around the Simbad position from photometry-enabled catalogues in VizieR.
The search radius has to be specified by the user. It is currently limited to a maximum of 30 arcsec. It depends mostly on the precision or quality of the coordinates (SIMBAD and VizieR catalogs), the resolution of the images from which the sources were extracted, source extent, and source crowding.
Suggestions are: crowded field: 0.5 to 1.5 arcsec, 3 arcsec otherwise; uncertain coordinates (SIMBAD quality E or coordinates without reference): 5 to 30 arsec (risky!).
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The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (41) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

LTT 4755 GJ 471.2 PLX 2887 UBV 11265
* eta Crv HD 109085 PLX 2887.00 UBV M 18330
* 8 Crv HIC 61174 PPM 225971 uvby98 100109085
** LAF 47A HIP 61174 RBS 1126 WDS J12321-1612A
BD-15 3489 HR 4775 ROT 1838 WEB 10892
CEL 4119 IRAS F12294-1555 1RXS J123204.3-161145 WISE J123203.91-161145.6
Ci 20 714 IRAS 12294-1555 SAO 157345 YZ 105 4810
GC 17087 JP11 2232 SKY# 23438 Gaia DR2 3526420114272476800
GCRV 7546 2MASS J12320424-1611455 TD1 16338
GEN# +1.00109085 NLTT 31021 TIC 1628071
GJ 9411 NSV 5690 TYC 6103-2394-1

References (291 between 1850 and 2021) (Total 291)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Collections of Measurements


velocities : 10    V* : 1    diameter : 1    distance : 1    ROT : 4    Fe_H : 3    PLX : 4    PM : 5    MK : 7   

   

Observing logs


herschel : 7    ISO : 2   

   


External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : * eta Crv

Link by name to the catalogue in VizieR :

BD-15 3489 CEL 4119 GJ 9411 GJ 471.2 HD 109085
HIC 61174 HIP 61174 HR 4775 IRAS F12294-1555 IRAS 12294-1555
2MASS J12320424-1611455 NLTT 31021 NSV 5690 PLX 2887 PPM 225971
1RXS J123204.3-161145 SAO 157345 TD1 16338 TYC 6103-2394-1 uvby98 100109085
WDS J12321-1612A WISE J123203.91-161145.6 Gaia DR2 3526420114272476800

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2021.07.31-19:02:25

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