ESpeRo: Echelle Spectrograph Rozhen

TL;DR

This paper details the design, parameters, and initial results of the ESpeRo echelle spectrograph at Rozhen Observatory, highlighting its resolution, spectral range, and performance characteristics.

Contribution

It introduces the ESpeRo spectrograph's design, parameters, and initial observational results, showcasing its capabilities for astronomical spectroscopy.

Findings

Spectral resolution ranges from 30000 to 45000.

Spectral coverage from 3900 to 9000 Å in one image.

Initial observations demonstrate the instrument's performance.

Abstract

In this paper we describe the echelle spectrograph of the 2 meter telescope of the Rozhen National Astronomical Observatory. The spectrograph is a cross-dispersed, bench-mounted, fiber-fed instrument giving a resolution from $\sim$30000 to $\sim$45000. The spectral range obtained in one single image is from 3900 to 9000 {\AA}. We describe the parameters of the fiber injection and the guiding unit, of the spectrograph itself, and of the detector. The identified orders and the resulting resolving power are presented. The opportunity to increase of the resolution by using a narrower slit is discussed and the corresponding loss of flux is calculated. The expected signal-to-noise ratio for a set of stars of different magnitudes was derived. Some of the first results obtained with ESpeRo are shortly described.