Reinhold Kroll

from Wikipedia, the free encyclopedia

Reinhold Kroll (born April 29, 1955 in Halgehausen ; † February 2, 2010 in Göttingen ) was a German astrophysicist .

Life

Reinhold Kroll was born in 1955 as the son of Wilhelm and Annemarie Kroll in Halgehausen ( Frankenberg (Eder) district ). From 1966 to 1974 he attended the Edertal School in Frankenberg. From 1975 he studied physics and astronomy at the University of Göttingen . He completed his studies in 1983 with his diploma thesis Spectroscopic Investigation of the Double Star System γ Arietis and continued with his doctorate on the topic of global variations in the photosphere of chemically peculiar stars (supervisor: Hans-Heinrich Voigt ) until 1988. He then worked at the Institute for Astronomy at the University of Würzburg until 1992 and from 1990 at the Instituto de Astrofísica de Canarias (IAC) in La Laguna / Tenerife. He suddenly passed away in early 2010.

plant

The work of Kroll made a decisive contribution to the understanding of the CP stars (very metal-rich red stars of the upper main sequence , usually with a rotation period of a few days). He developed a method to determine the temperature and gravity of such closer stars individually (instead of just averages in star clusters ), which made details about age and temporal development known, and a much more precise observation of their spectral lines is possible. He proved that the high frequency of metal is responsible for a redistribution of light from the short-wave to the visible. According to his extensive measurements, fluctuations in brightness due to rotation are present in all wavelengths, the spectral lines and the magnetic field. The increase in temperature or pressure with depth suggests a corresponding residual brightness in the middle area or at the inner edge in spectral lines; Both can be calculated from their spectrometry. Their variability depending on the side of the star being viewed means a horizontal redistribution of pressure and temperature through the magnetic field.

In the instrumental field, Kroll made a significant contribution to the establishment of the GCT solar telescope in Tenerife.

Honors

In 1990 the minor planet (17412) Kroll was named after him.

Web links

Individual evidence

  1. ^ Annual report of the Göttingen University Observatory 1983
  2. ^ Annual report University Observatory Göttingen 1988. (No longer available online.) Formerly in the original;
  3. ^ The annual meeting of the AG 2010 in Bonn . In: Communications from the Astronomical Society . tape 94 , 2015, p. 719–724 ( astronomische-gesellschaft.de [PDF] p. 736, deceased members).
  4. ↑ Reg. (17412) Kroll
personal data
SURNAME Kroll, Reinhold
BRIEF DESCRIPTION German astrophysicist
DATE OF BIRTH April 29, 1955
PLACE OF BIRTH Halgehausen
DATE OF DEATH February 2, 2010
Place of death Goettingen