Query : 2015A&A...580A..10C

2015A&A...580A..10C - Astronomy and Astrophysics, volume 580A, 10-10 (2015/8-1)

New Mn II energy levels from the STIS-HST spectrum of the HgMn star HD 175640.


Abstract (from CDS):

The NIST database lists several MnII lines that were observed in the laboratory but not classified. They cannot be used in spectrum synthesis because their atomic line data are unknown. These lines are concentrated in the 2380-2700Å interval. We aimed to assign energy levels and loggf values to these lines. Semi-empirical line data for MnII computed by Kurucz were used to synthesize the ultraviolet spectrum of the slow-rotating, HgMn star HD175640. The spectrum was compared with the high-resolution spectrum observed with the HST-STIS equipment. A UVES spectrum covering the 3050-10000Å region was also examined. We determined a total of 73 new energy levels, 58 from the STIS spectrum of HD175640 and another 15 from the UVES spectrum. The new energy levels give rise to numerous new computed lines. We have identified more than 50% of the unclassified lines listed in the NIST database and have changed the assignment of another 24 lines. An abundance analysis of the star HD175640, based on the comparison of observed and computed ultraviolet spectra in the 1250-3040Å interval, is the by-product of this study on MnII.

Abstract Copyright:

Journal keyword(s): line: identification - atomic data - stars: atmospheres - stars: chemically peculiar - stars: individual: HD 175640

VizieR on-line data: <Available at CDS (J/A+A/580/A10): tablea1.dat tablea2.dat>

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 V* V1027 Sco a2* 16 08 34.5616203192 -39 05 34.278268848   6.552 6.629 6.66   A0/3III 184 0
2 * iot Her bC* 17 39 27.8860861 +46 00 22.800110 2.940 3.630 3.800     B3IV 438 1
3 HD 175640 * 18 56 22.6598858520 -01 47 59.503936200 5.86 6.149 6.196     B9IIIpHgMnEu 143 0

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