2016ApJ...818L..17G

Query : 2016ApJ...818L..17G

2016ApJ...818L..17G - Astrophys. J., 818, L17 (2016/February-2)

Protoplanetary disk shadowing by gas infalling onto the young star AK Sco.

GOMEZ DE CASTRO A.I., LOYD R.O.P., FRANCE K., SYTOV A. and BISIKALO D.

Abstract (from CDS):

Young solar-type stars grow through the accretion of material from the circumstellar disk during pre-main-sequence (PMS) evolution. The ultraviolet radiation generated in this process plays a key role in the chemistry and evolution of young planetary disks. In particular, the hydrogen Lyα line (Lyα) etches the disk surface by driving photoevaporative flows that control disk evolution. Using the Hubble Space Telescope, we have monitored the PMS binary star AK Sco during the periastron passage and have detected a drop of the H2 flux by up to 10% lasting 5.9 hr. We show that the decrease of the H2flux can be produced by the occultation of the stellar Lyα photons by a gas stream in free fall from 3 R*. Given the high optical depth of the Lyα line, a very low gas column of NH > 5 x 1017/cm2 suffices to block the Lyα radiation without producing noticeable effects in the rest of the stellar spectral tracers.

Abstract Copyright: ∼

Journal keyword(s): binaries: spectroscopic - stars: magnetic field - stars: pre-main sequence

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 - 2026 		#notes
1 V* AK Sco Ae* 16 54 44.8491575376 -36 53 18.566586456 9.80 9.63 9.00     F5V 304 1

Query : 2016ApJ...818L..17G

Basic data :
V* AK Sco -- Herbig Ae/Be Star
Other object types: otypes_help 		TT* (), * (2023A&A,HD,...), V* (AN,ASAS,...), MIR (AKARI,MSX5C,...), Or* (2017ARep), Ae* (1999AJ), Y*O (2003A&A), SB* (2003A&A), AB? (1991A&AS), Er* (2012A&A), Em* (HBC), NIR (2MASS), IR (IRAS)
ICRS coord. (ep=J2000) : 		16 54 44.8491575376 -36 53 18.566586456 (Optical) [ 0.0272 0.0171 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		16 51 23.1458408656 -36 48 28.463324064 [ 0.0272 0.0171 90 ]
Gal coord. (ep=J2000) : 		347.3778516420552 +04.2013154471250 [ 0.0272 0.0171 90 ]
Proper motions mas/yr : 		-7.927 -28.913 [0.036 0.028 90] A 2020yCat.1350....0G
Radial velocity / Redshift / cz : 		V(km/s) -1.30 [2.6] / z(~) -0.000004 [0.000009] / cz -1.30 [2.60]
   C 2006AstL...32..759G
Parallaxes (mas): 		7.1543 [0.0312] A 2020yCat.1350....0G
Spectral type: 		F5V C 1982MSS...C03....0H
Fluxes (7) :
U 9.80 [~] C 2002yCat.2237....0D
B 9.63 [~] C 2002yCat.2237....0D
V 9.00 [~] C 2002yCat.2237....0D
G 9.064188 [0.014719] C 2022yCat.1355....0G
J 7.676 [0.026] C 2003yCat.2246....0C
H 7.06 [0.03] C 2003yCat.2246....0C
K 6.503 [0.020] C 2003yCat.2246....0C
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Hierarchy : number of linked objects
whatever the membership probability is (see description here ) :

: 3 : 3537 Display criteria :

Identifiers (31) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

HD 152404 GEN# +1.00152404 MSX5C G347.3777+04.2010 UCAC2 16222735
AKARI-IRC-V1 J1654448-365318 GSC 07371-00870 PDS 93 V* AK Sco
AKARI-FIS-V1 J1654450-365317 HBC 271 PPM 295643 WISE J165444.84-365318.7
AN 221.1907 HIC 82747 SAO 208174 AAVSO 1648-36
ASAS J165445-3653.3 HIP 82747 SSTGLMC G347.3777+04.2010 Gaia DR3 5971474902099064576
CD-36 11056 IRAS 16514-3648 SV* HV 3057 Gaia DR1 5971474897726932992
CPC 18 8371 JP11 2800 TIC 339989392 Gaia DR2 5971474902099064576
CPD-36 7072 2MASS J16544485-3653185 TYC 7371-870-1

References (304 between 1850 and 2026) (Total 304)
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 Description of Measurements

Velocities : 2    Distance : 4    Var : 1    Rot : 2    Fe/H : 2    Plx : 5    PM : 5    SpT : 6   

   

Observing logs
ISO : 11    IUE : 10   

   

External archives :

Data at NED - NASA/IPAC Extragalactic Database : V* AK Sco

Link by name to the catalogue in VizieR :

HD 152404 AKARI-IRC-V1 J1654448-365318 AKARI-FIS-V1 J1654450-365317 CD-36 11056 CPD-36 7072
GSC 07371-00870 HIC 82747 HIP 82747 IRAS 16514-3648 2MASS J16544485-3653185
MSX5C G347.3777+04.2010 PPM 295643 SAO 208174 SSTGLMC G347.3777+04.2010 TYC 7371-870-1
UCAC2 16222735 V* AK Sco WISE J165444.84-365318.7 Gaia DR3 5971474902099064576 Gaia DR1 5971474897726932992
Gaia DR2 5971474902099064576

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